exam Maths Puzzle Numerical Ability

I have made many attempts to answer this equation and cannot come up with the answer - please help. The problem is -2(x-b)-(5a-x)=a+b

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exam Other Question

6 square root 12 over 3 square root 6 square root of x+1 + square root of x-1 = square root of 2x+1
Please help....if you can break it down to the simplest my book does not explain how to work with one that involves three radicals. Thank you so much