So let's subtract 2x minus 2y from both sides. So over here we're going to subtract minus. We're going to subtract 2x minus 2y from that side. And then we could also subtract a dy dx from both sides. So that all of our dy dx's are on the left hand side and all of our non-dy dx's are on the right hand side. So let's do that. So we're going to subtract a dy dx on the right and a dy dx here on the left.