And here I have one minus negative one. So that's one plus one, so times two. So maybe I'll write it this way. Plus two times the second derivative of y with respect to x is equal to 1 4th. And so let's see, I have 1 8th plus two times the second derivative is equal to 1 4th. And let's see, I could subtract 1 8th from both sides. So subtract 1 8th, subtract 1 8th.