exam Maths Puzzle Numerical Ability

Subtract. Express your answer in simplest terms.

4/7 - (x-3)/(4x+3)

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exam Other Question

Please help me solve this equation"
Find all #'s for which the rational expression is undefined
w^2+6 / w^2-3w-18 I am not sure how to set up the equation or how to solve this word problem.

Elena bicycles 5km/h faster then Carlos. In the same time it takes Carlos to bicycle 39km, Elena can bicycle 54km. How fst does each bicyclist travel?