exam Maths Puzzle Numerical Ability

-x-(13+4x) = -3(5-9x)+2

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exam Other Question

(w^2 - 1)/(w-1)^2 (w-1)/(w^2 + 2w +1)

I get a different answer every time I do it. I need all the steps. thank you For the exponential function e^x and logarithmic function log x, graphically show the effect if x is doubled.