book Maths Puzzle Numerical Ability

3(z+3)-7=8

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book Other Question

Simlify. (x-y/x+y)+(x+y/x-y)
x2-y+xy/x+x3-xy2
Please help me to solve this one. Thank you.

You want to plant a small rectangular garden in your back yard. To keep out
animals, you will completely enclose the garden with w