book Maths Puzzle Numerical Ability

(n+2 divided by 2) + (n+1 divided 6)

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book Other Question

find all values of y which satisfy the equation

[(y+7)/(y+1)] +1
=[(y+7)/(y-1)]
Hoe do I solve this problem?

4 / a - 5 - 1 / 5 - a