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

1. Solve the equation: 4(2x-3)=6-(3-2x)

2. Solve: 0=3/18y-18

3. 4y2-49

4. simplify: (-5d5 ef2)exponent2 A swimming pool can be filled in 6 h and requires 9 h to drain. If the drain was accidentally left open for 6 h while the pool was being filled, how long did filling the pool require?