book Maths Puzzle Numerical Ability

this is a practice problem for a placement test for college. I have the answer but I dont understand how they got it. Help Please! 7x-8(y-x)+3y= 5(3x-y)

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book Other Question

Perform the indicated operations. Simplify the result.

(x-11/2x + 10) / (x^2 - 8x - 33/x + 5) * (x + 3/x^2)
4x^5 + 10x^4 - 16x^2 divide by 4x^2

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