exam Maths Puzzle Numerical Ability

Simplify the rational expression:
(x/x^2-4)- (x+2/ x^2-x-2)
I am trying to find the numerator.

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exam Other Question

The sum of two counting numbers is 91. Half of one number equals three times the other number. What are the number? I need help solving for x in the following problem: 3(cx-b)+c = ax+d/a
The ax+d part is all over a.

I have no idea where to start, but I know proportions can be used?