book Maths Puzzle Numerical Ability

3-4z=-5+8z

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book Other Question

1) Twice a number x increased by 12 is 31 less than three times another number y. solve for x

2) Five eighths of a number x is three more than one half of another number y. solv 8x + 15/x = 29

I need to show the work...I just know the answer is three but I cannot explain how I got there....HELP