diff --git a/Program.cs b/Program.cs
index 80a681e..7b24a41 100644
--- a/Program.cs
+++ b/Program.cs
@@ -5,10 +5,12 @@ class lpr381
     {
         //simplex simplex = new simplex();
         //simplex.simplexAlgo();
-        twoPhaseSimplex twoPhaseSimplex = new twoPhaseSimplex();
-        twoPhaseSimplex.twoPhaseSimplexAlgo();
+        //twoPhaseSimplex twoPhaseSimplex = new twoPhaseSimplex();
+        //twoPhaseSimplex.twoPhaseSimplexAlgo();
         //chesssolver chesssolver = new chesssolver();
         //chesssolver.chessAlgo();
+        dualSimplex dualSimplex = new dualSimplex();
+        dualSimplex.dualSimplexAlgo();
     }
 }
 
diff --git a/dualSimplex.cs b/dualSimplex.cs
new file mode 100644
index 0000000..6423669
--- /dev/null
+++ b/dualSimplex.cs
@@ -0,0 +1,223 @@
+using ConsoleTables;
+
+class dualSimplex
+{
+    public void dualSimplexAlgo()
+    {
+        file file = new file();
+        Tuple<List<zConstraints>, List<Constraints>> content = file.readFile();
+        List<zConstraints> zConstraintsList = content.Item1;
+        List<Constraints> constraintsList = content.Item2;
+
+        // print constraintsList
+        foreach (zConstraints constraints in zConstraintsList)
+        {
+            Console.WriteLine(constraints.minMax + " " + string.Join(" ", constraints.values));
+        }
+        foreach (Constraints constraints in constraintsList)
+        {
+            Console.WriteLine(constraints.sign + " " + string.Join(" ", constraints.values));
+        }
+        List<List<float>> table = new List<List<float>>();
+        table.Add(zConstraintsList[0].values);
+        // add all constraints in constraintsList to table
+        foreach (Constraints constraints in constraintsList)
+        {
+            table.Add(constraints.values);
+        }
+        List<List<float>> newTable = new List<List<float>>();
+
+                // add all rows in table to newTable
+        foreach (List<float> row in table)
+        {
+            // add all columns in row to newTable without reference to table
+            List<float> newRow = new List<float>();
+            for (int i = 0; i < row.Count; i++)
+            {
+                newRow.Add(row[i]);
+
+            }
+            newTable.Add(newRow);
+        } 
+        int varCount = newTable[0].Count;
+        table = prepareTable(newTable, constraintsList);
+        // print every row in table
+        printTable(table, varCount);
+        
+    }
+
+
+    List<List<float>> prepareTable(List<List<float>> table, List<Constraints> constraints)
+    {
+        List<List<float>> newTable = new List<List<float>>();
+        foreach (List<float> row in table)
+        {
+            List<float> newRow = new List<float>();
+            foreach (float value in row)
+            {
+                newRow.Add(value);
+            }
+            newTable.Add(newRow);
+        }
+        List<string> signs = new List<string>();
+        foreach (Constraints constraint in constraints)
+        {
+            signs.Add(constraint.sign);    
+        }
+        for (int i = 0; i < signs.Count ; i++)
+        {
+            table[0].Add(0);
+            table[0].Add(0);
+
+            // if sign[i] == "=" copy table[i] to table[i+1] without overwriting table[i+1]
+            if (signs[i] == "=")
+            {
+                List<float> tempRow = new List<float>();
+                foreach (float value in table[i+1])
+                {
+                    tempRow.Add(value);
+                }
+                table.Add(tempRow);
+                // move last row of table to table[i+2]
+                for (int j = table.Count - 1; j > i+2; j--)
+                {
+                    List<float> row = table[j];
+                    table[j] = table[j-1];
+                    table[j-1] = row;
+                }
+                signs.Add("2=");
+                for (int j = signs.Count - 1; j > i + 1; j--)
+                {
+                    string sign = signs[j];
+                    signs[j] = signs[j-1];
+                    signs[j-1] = sign;
+                }
+                newTable.Insert(i+1, newTable[i+1]);
+            }
+
+            if (signs[i] == ">=")
+            {
+                // multiply table[i+1] by -1
+                for (int j = 0; j < table[i+1].Count; j++)
+                {
+                    table[i+1][j] = table[i+1][j] * -1;
+                }
+            }
+
+            // add 3 0s to each row for every column in table
+            for (int j = 0; j < signs.Count ; j++)
+            {
+                if (signs[i] == ">=")
+                {
+                    // make s = 1 
+                    if (i == j)
+                    {
+                        table[i+1].Add(0);
+                        table[i+1].Add(1);
+                    }
+                    else
+                    {
+                        table[i+1].Add(0);
+                        table[i+1].Add(0);
+                    }
+                }
+                else if (signs[i] == "<=")
+                {
+                    //make e = 1
+                    if (i == j)
+                    {
+                        table[i+1].Add(-1);
+                        table[i+1].Add(0);
+                    }
+                    else
+                    {
+                        table[i+1].Add(0);
+                        table[i+1].Add(0);
+                    }
+                }
+                else if (signs[i] == "=")
+                {
+                    // make a = 1
+                    if (i == j)
+                    {
+                        table[i+1].Add(-1);
+                        table[i+1].Add(0);
+                    }
+                    else
+                    {
+                        table[i+1].Add(0);
+                        table[i+1].Add(0);
+                    }
+                }
+                else if (signs[i] == "2=")
+                {
+                    // make a = 1
+                    if (i == j)
+                    {
+                        table[i+1].Add(0);
+                        table[i+1].Add(1);
+                    }
+                    else
+                    {
+                        table[i+1].Add(0);
+                        table[i+1].Add(0);
+                    }
+                }
+            }
+        }
+        table[0].Add(0);
+
+                // remove intex newTable.Count-1 from table and place it in the back of table
+        for (int i = 1; i < table.Count; i++)
+        {
+            table[i].RemoveAt(newTable[i].Count-1);
+            if (signs[i-1] == ">=" || signs[i-1] == "2=")
+            {
+                table[i].Add(newTable[i][newTable[i].Count-1] * -1);
+            }
+            else
+            {
+                table[i].Add(newTable[i][newTable[i].Count-1]);
+            }
+
+        }
+        // remove the value of newTable.Count-1 from table[1] and place it in the back of table[1]
+        return table;
+    }
+
+    void printTable(List<List<float>> table, int varCount)
+    {
+        int count = 1;
+        string[] headers = new string[table[0].Count];
+        for (int i = 0; i < table[0].Count; i++)
+        {
+            if (i < varCount)
+            {
+                headers[i] = "x" + (i + 1);
+            }
+            else if (i < table[0].Count - 1)
+            {
+                headers[i] = "e" + (count);
+                headers[i+1] = "s" + (count);
+                i = i + 1;
+                count++;
+            }
+            else
+            {
+                headers[i] = "rhs";
+            }
+        }
+        var conTable = new ConsoleTable(headers);
+        foreach (List<float> row in table)
+        {
+            // convert row to object array
+            object[] rowArray = new object[row.Count];
+            for (int i = 0; i < row.Count; i++)
+            {
+                rowArray[i] = row[i];
+            }
+            conTable.AddRow(rowArray);
+        }
+        conTable.Write(Format.Alternative);
+    }
+}
\ No newline at end of file
diff --git a/input.txt b/input.txt
index 8840b15..26dcc6e 100644
--- a/input.txt
+++ b/input.txt
@@ -1,5 +1,5 @@
 max +1 +1
-+8 +4 <= 160
++8 +4 = 160
 +4 +4 <= 100
 +1 +0 <= 17 
 +1 +0 >= 5
diff --git a/obj/Debug/net6.0/lpr381.csproj.CoreCompileInputs.cache b/obj/Debug/net6.0/lpr381.csproj.CoreCompileInputs.cache
index 393397b..dfdc1a2 100644
--- a/obj/Debug/net6.0/lpr381.csproj.CoreCompileInputs.cache
+++ b/obj/Debug/net6.0/lpr381.csproj.CoreCompileInputs.cache
@@ -1 +1 @@
-42cc27e0497d325b5a06d599f420fe32fe1e67ba
+8c13023fa8aa1aee00b6cf6a6819800d58bb1521
diff --git a/obj/Debug/net6.0/lpr381.dll b/obj/Debug/net6.0/lpr381.dll
index c929f15..804d884 100644
Binary files a/obj/Debug/net6.0/lpr381.dll and b/obj/Debug/net6.0/lpr381.dll differ
diff --git a/obj/Debug/net6.0/lpr381.pdb b/obj/Debug/net6.0/lpr381.pdb
index c28b416..b6147dc 100644
Binary files a/obj/Debug/net6.0/lpr381.pdb and b/obj/Debug/net6.0/lpr381.pdb differ
diff --git a/obj/Debug/net6.0/ref/lpr381.dll b/obj/Debug/net6.0/ref/lpr381.dll
index 32e9914..5fbb2f8 100644
Binary files a/obj/Debug/net6.0/ref/lpr381.dll and b/obj/Debug/net6.0/ref/lpr381.dll differ
diff --git a/twoPhaseSimplex.cs b/twoPhaseSimplex.cs
index 411935b..8f2bd01 100644
--- a/twoPhaseSimplex.cs
+++ b/twoPhaseSimplex.cs
@@ -286,7 +286,7 @@ class twoPhaseSimplex
         return table;
     }
 
-        static int findPivotCol(List<List<float>> table)
+    static int findPivotCol(List<List<float>> table)
     {
         float largest = 0;
         int largestIndex = 0;
@@ -428,8 +428,5 @@ class twoPhaseSimplex
             }
         }
         return table;
-
     }
-
-    
 }
\ No newline at end of file