So, let me rewrite this differential equation. We have dw dt is equal to one over 25 times w minus 300. Now, this differential equation, we have w here, and we have this dt, but we don't have t anywhere else. So, what I wanna do is I wanna get the parts that involve w onto the left-hand side. And I wanna get anything that deals with dt on the right-hand side. So, let's divide both sides of this equation by w minus 300. So, we would have one over w minus 300, dw dt, the derivative of w with respect to t, is equal to, well, I divided this side by w minus 300, so it's equal to one over 25.