diff --git a/dist/index.js b/dist/index.js
index a47e75f..3f295b1 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -103,13 +103,6 @@ var Equation = {
       stack = sortStack(stack);
       stack = _.parseNumbers(stack);
       stack = solveStack(stack);
-      // expression = expression.replace(/[a-z]*/g, a => {
-      //   let index = variables.indexOf(a);
-      //   if (index > -1) {
-      //     return args[index] || 0;
-      //   }
-      //   return a;
-      // });
 
       return stack;
     };
diff --git a/equation.js b/equation.js
index 8285bcc..ad1e053 100644
--- a/equation.js
+++ b/equation.js
@@ -280,13 +280,6 @@ var Equation = {
       stack = sortStack(stack);
       stack = _.parseNumbers(stack);
       stack = solveStack(stack);
-      // expression = expression.replace(/[a-z]*/g, a => {
-      //   let index = variables.indexOf(a);
-      //   if (index > -1) {
-      //     return args[index] || 0;
-      //   }
-      //   return a;
-      // });
 
       return stack;
     };
diff --git a/lib/index.js b/lib/index.js
index 8fb0e3e..944ea63 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -76,13 +76,6 @@ let Equation = {
       stack = sortStack(stack);
       stack = _.parseNumbers(stack);
       stack = solveStack(stack);
-      // expression = expression.replace(/[a-z]*/g, a => {
-      //   let index = variables.indexOf(a);
-      //   if (index > -1) {
-      //     return args[index] || 0;
-      //   }
-      //   return a;
-      // });
 
       return stack;
     };