book Maths Puzzle Numerical Ability

I need some help with this problem.

Perform the indicated operation involving rational expressions:

(2x+6/7y) - (x^2+5/x^2+6x+9)

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book Other Question

The length of a rectangle is 2 in. more than twice its width. If the perimeter of the rectangle is 34 in., find the dimensions of the rectangle. How would I go about simplifying this problem.

x^2-x-6 / x^2-9

Thank You for your help.