And this is equal to the natural log of the absolute value of u. Or, if you unwind the substitution, this is equal to the natural log of the absolute value of w minus 300. So, let me write this down. So, the left-hand side right over here, and you might be able to do that in your head. You say, hey, look, you have w minus 300. Its derivative is one, so it's essentially there. So, I can just take this as if this was one over, I can just take the antiderivative here and treat this whole thing as kind of a variable.