exam Maths Puzzle Numerical Ability

I need so help with this problem.
given that (3x-a)(x-2)(x-7)=3x^3-32x^2+81x-70 what is the value of a?

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exam Other Question
Solve and graph: 2 - |x| ≥ -2, D = {Integers} Please help me solve this equation:
(x^2)+(sqrt22)(x)=0

Thank you!