Anybody up for some BASIC algebra?

I've got a take home test for a math108 class and would much rather watch The Adventures of Pete and Pete than struggle through this for the next 3 hours... I've only got about 10 problems left that I don't know how to do, plz help me anonymii.

1) "Simplify the expression. Express the answer so that all exponents are posetive. Whenever an exponent is 0 or negative, we assume that the base is not 0.

-3x^-3 "

Someone try this...

[3x/(x^2-5x-36)] - [x-1/(x^2-16)] + [1/(x^2-13x+36)]

Just factor... I came up with some huge trinomial that I didn't even want to fuck with :'(