Now let's go to the right-hand side of this equation. This is going to be equal to the derivative of x with respect to x is 1. The derivative of y with respect to x, we're just going to write that as the derivative of y with respect to x. And then finally, the derivative with respect to x of a constant, that's just going to be equal to 0. Now let's see if we can solve for the derivative of y with respect to x. So the most obvious thing to do, let's make it clear. This right over here I can rewrite as 2x minus 2y.