1) Where did the 'x' go?
1) Should this be an equation or function defintion? It's just an expression.
2) Where did the '3' go?
2) Why is the '2' in the numerator?
2) You did square '20', but there is nothing in your equation #1 to indicate that you should have done that.
2) The equation did come back!
3) Where did the 'x' go?
3) Where did the equation go again?
Use very careful and consistent notation.