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

trace the hyperbola x^2/16 - y^2/9 = 1 A clerk was asked to change a $10 bill. She returned 9 more dimes than nickels and 21 more quarters than dimes. How many of coins of each did she return?