book Maths Puzzle Numerical Ability

please help with breakdown to simplet form:
7m-3m+4-32q

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book Other Question

Need help fast...Please someone show me how to do this.

Solve X in (x-2)(x+5)=0

also

Solve Y in 16(y-3)^2=64

and

Solve Y in y^2+2y-3=0

I am so confused...
Thanks The diagonal of a square television screen measures 18 inches. What is the length of the sides?