Simplifying rational algebraic expressions?

Ashley

New member
I don't know how to do any of these problems so if any one can give me steps on how to solve them, that would be a great help!! Thanks!!!

1. 2/x+3 - 4x-7/2x^2+13x+21
2. x^3-1/x-1 / x^2-1/x+1
3. (3x+4xy-7xz^2) - (2x^2-4xy+2xz^2)
 
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