book Maths Puzzle Numerical Ability

Question goes like this....
Simplify each sum.
5x/x^2-9 + 2/x+4

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book Other Question
How do I solve?

x+2/4 = x+1/2

Thank you! y+2/ yexponent 2 -8y +16 + y/ 3yexponent 2 = 8y -16