exam Maths Puzzle Numerical Ability

i am having a hard time getting this : (y / y^2 -1) + (y-1 / y +1) - 2y / 1 - y)

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exam Other Question

the larger of two consecutive ingers is 7 greater than twice the smaller.
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Find the LCM of z^2-4 and z^2+11z+18.