exam Maths Puzzle Numerical Ability

Homework example. Please show me how to solve this complex fraction. Thanks!

(3/x-2)+(21/x^2-4)=(14/x+2)

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exam Other Question

Solve:
(for w) 5-5w+x=0
each box weighs 3 1/6 and there are 6 boxes in all what is the total weight?