exam Maths Puzzle Numerical Ability

I need help with these type of equations please,
-9h=-3(-3)

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exam Other Question

Factor each expression.

a^2(b-c)-16b^2(b-c)
hi i really dont understand what to do for this equation please help me out. thanks i apreciate it.
(16x) over (25x^2-5) times ( 2x^2-x-1) over(8x)