exam Maths Puzzle Numerical Ability

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5 sq.root 75-6 sq.root 3

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Hello, I am currently attempting to correct questions from an exam in my algebra class. I would greatly appreciate any help. The problem is as follows:

y-2/y + 2/y = y+1/y-3 Please help me with this problem:
I did this but I was told is wrong
36^1/2/15^2 = 6/225 = 2/75