Simple algebra, derivations, integrations. Desperate need of help :) Hi! This is my first post here (and it's not a very funny one). :) It's been a long time since I took any math, and I'm getting more and more confused. Need some help! a'*m' = b'*m a*m' = b*m b-b'=(a-a')*(m/m') (a-a')+(b-b')=(a-a')*(?) What's supposed to fit where the question mark stands? More stupid questions to come.