exam Maths Puzzle Numerical Ability

I am having trouble with solving the addition and multipilcation principals for following algebra problem.

18 - 9y - 7y <50

Could someone help.

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exam Other Question

(1/32)^-3/5 What is the answer to:
2x^3-4x^2-3x+1
when x=-3
x=-2
x=-1
I have two answers (one answer from calculator