book Maths Puzzle Numerical Ability

Simlify. (x-y/x+y)+(x+y/x-y)
x2-y+xy/x+x3-xy2

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book Other Question

Can someone show me how to simplify these 2 problems--please show me the steps

(2x)^2 * (3x^4)

and

(-3x divided by 2y^3)^-2
3(z+3)-7=8