You can put this solution on YOUR website! a) 2a - 3b + 4a - 5b = 6a - 8b
b) n + n + n + n + 2n = 6n
I hope you see the pattern, just combine like-terms. In (a) we had 2a plus 4a to give us 6a, and the same process was used on the b's. In (b), just count all the n's (keeping in mind 2n is just n + n). I'll leave the last one for you because the formatting is a little messed up.
