exam Maths Puzzle Numerical Ability

please help me to solve this equation: [(x-)1/1-(1/x)]/[(x+)1/1+(1/x)]

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exam Other Question

The perimeter of a rectangle is 52m. The length is 2m more than twice the width. Find the dimensions. Hi there! I am having terrible trouble trying to simplify this expression. Instructions say to simplify and express the answer using positive exponents.
[2x^(3/4)*y^(-1/2)]^(-8)