And then, of course, all of that is going to be equal to 0. Now all we have to do is take this and put it on the right-hand side. So we'll subtract it from both sides of this equation. So on the left-hand side, and actually all the stuff that's not a dy dx I'm going to write in green. So on the left-hand side, we're just left with 3 times y minus x squared times dy dx. dy, the derivative of y with respect to x, is equal to, I'm just going to subtract this from both sides, is equal to negative 2x plus this. So I could write it as 3 times y minus x squared plus, sorry, minus 2x.