book Maths Puzzle Numerical Ability

How to solve:

(3x-2)(x+5)

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book Other Question

when you have an equation like 1/4x+5=28, and you have to find x, how do you get rid of the fraction? I can not seem to enter this into the solver correctly, can you help?

x^2+8x+12/x-5
_____________
3x+18/x^2-25

I tried to enter it as fraction divided by fraction