exam Maths Puzzle Numerical Ability

perform & simplify
5y - y[9+6(y-2)]

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exam Other Question

I need a little help with these 2 problems in putting them in rational form.
-3(x + 5)+3=12 and 2/3x + 1/6x=2 At a given hour, two cars leave a city in the same direction. One travels at 60 mph, and the other travels at 75 mph. In how many hours will the cars be 90 miles apart?