Coming in here with the following question, when I see what kind of stuff you normally tackle, is very embarrassing! But... I simply am too rusty for this stuff, it seems. This is NOT homework. This is something I need to do in a game I'm working on. I end up in and endless loop when trying to isolate a variable of an equation. And I have no idea what approach to use to get out of it. After lots of moving around in the original equation, I end up with this. Which is correct, if I plot in some values. But I need to have a completely isolated. a=b-((c*d)/a) Then I try to multiply by "a" on all a^2 = b*a-c*d So Now I need to divide by "a" a = b-((c*d)/a) Aaand. I'm back. Please help me out with what seems to be VERY easy, if you know your stuff.