exam Maths Puzzle Numerical Ability

Please help me solve this equation"
Find all #'s for which the rational expression is undefined
w^2+6 / w^2-3w-18

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exam Other Question

Could you please take the time to help me solve this problem: Solve f(x) = 0 for x, if f(x) = [ (2x . 42x) / (2-2x) ] - 128. Show your work.

Thank you for helping me
Subtract. Express your answer in simplest terms.

4/7 - (x-3)/(4x+3)