That goes away, and then those go away, and you would just be left with, you are left with negative times the mean, the negative mean of the x, y's. Plus m times the mean of the x squareds, m times the mean of the x squareds, plus b times the mean of the x's is equal to 0. That's this first expression when you divide both sides by negative 2n. And then the second expression will be, this will go away. This is when you divide it by 2n. I don't want to say negative 2n. That's when you divide it by 2n, you get this.