exam Maths Puzzle Numerical Ability

I need to see how this was solved: x/x-1 - 2/1-x^2 = 8/x+1

Thank you

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exam Other Question

D is between E and F. Find ED given EF=15 and DF=3?

M is between L and N. Us e the segment addition postulate to solve for x AND find the length of each segment
LM=3x+8
MN=2x+ For a sample of size n=60, proportion p=0.35, and 95% confidence level, the lower bound of the proportion is ______?