book Maths Puzzle Numerical Ability

I need help with the following problem.

Solve for X
6/x^2-1 + 5/x+1 = 3/x-1

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book Other Question

A motorboat goes 5 miles upstream in the same time it requires to go 7 miles downstream. The river flows at 2 miles per hours. What is the speed of the boat in still water? How do i solve this in synthetic division (x to the third power plus x to the second power minus threex plus four)divided by (x minus three)