exam Maths Puzzle Numerical Ability

Solve: 1/w + w/w-1 = 1/w-w^2

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exam Other Question

three times the difference of a number x and 5 = ? Could someone check my work on this problem:

x/(x-2)-2/x

x^2-2(x-2)/(x-2)x

x^2+(-2x-2(-2))/(x-2)x

x^2 + (-2x + 2 * 2)/(x - 2)x

x^2 + (-2x + 4)/(x-2)x

x^2 - 2x + 4/(x-2)x