exam Maths Puzzle Numerical Ability

1/a + 1/x = 1/b
solve for x. how would you do this. thank you

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exam Other Question

I am taking a college calculus class afterm some time off and I cannot remember how to solve simplify a polynomial with division.

It is as follows: [(x+3/x+1)-2]/(x-1). What are the rules to remember and how would I begin solving this? Could you please help me solve this by completing the square:

x^2+10x-8=0