Hello, I'm just doing a quick review of old material for my pre-calc class and I believe I'm in for a rude awakening. It's been at least 2 years since I've done algebra and I've pretty much forgotten most of it. If somebody could be so kind as to walk me through the steps necessary to solve this I'd be very great-full, thank you.

Instructions are to simplify:

b - a^-1 / a - b^-1