So it looks very complicated, but remember we're just trying to solve for the m's and the b's. And we have two equations with two unknowns here. We have the m's, we have the m's, and then we have the b's. And to simplify this, both of these equations, actually the top one and the bottom one, both sides are divisible by 2n. I mean, 0 is divisible by anything. It'll be just 0. So let's divide the top equation by 2n and see what we get.