You won't be able to algebraically separate the y's and d y's on one side, and the x's and d x's on the other side. But this one we were able to. And so that's why this is called a separable differential equation. Differential, differential equation. And it's usually the first technique that you should try. Hey, can I separate the y's and the x's? And as I said, this is not going to be true of many, if not most differential equations.