who can tell me how to solve for the variable on the left.

x y

This is the easiest question I've seen! How COULDN'T someone figure this out. It's all so simple! X=X!

if you know your value for "Y" then its easy to solve. y is a function of x, meaning that y is the manipulated form of X. (y=2x; if y=12 then to solve for x divide 12 by 2, thus x=6)