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Okay, so I've done all the working out and I'm up to this step: 6a*ab-3a ------------- 2b-1 Ahh sorry, I don't know how to express the a to the power of two on a computer. Anyway, so I have to simplify it down, but what do I do with the minus one? How do I simplify it with that there?

I'm thinking about getting back into writing fantasy again, but I thought I'd better acquaint myself in the genre again.