exam Maths Puzzle Numerical Ability

Solve by substitution.
8x - 4y = 16
y = 2x - 4

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exam Other Question

76. (x^3-1)/(x^2+1) divided by (9x^2+9x+9)/(x^2-x)

I do not know where to start on this problem let alone how to do it. I need to find the product of this problem:(2x-5)^2. Thank you for your help!!