And the main differential or class of differential equations that you could solve are the ones, are separable differential equations. The ones where you can separate the independent and the dependent variables. And if you don't have any idea of what I'm talking about, I'm about to show you. 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.