book Maths Puzzle Numerical Ability

how do i solve: 1/8(16y+8)-17= -1/4(8y-16)
i need a step by step answer

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The problem I'm having trouble with is

If x = –1 and y = 2, what is the value of the expression 2x3(thats cubed) – 3xy ?

I understand how to substiture the numbers in, but
please help solve this
3x=wyz

solve for x, w, and y
please explain so i can try to do others without help, thank you very much