Well, same drill. f prime of x is going to be equal to one. And so we have to see, is f prime of x, which is equal to one, is it equal to f of x, which is x plus one, x plus one, minus x? And so here, you see no matter what x is, this equation is going to be true. So this is a solution, is a solution. Let's do a few more of these. Let me scroll down a little bit so I have a little bit more, a little bit more space, but make sure we see our original differential equation.