exam Maths Puzzle Numerical Ability

add and express in simplest form

6/3x-2 + 3/2x

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exam Other Question

Factor the polynomial 27x^3 - 8y^3

MY WORK 27^3 = 19683x
8Y^3 = 512
the answer is 42 from the back of the book. I wrote the problem as: 5/6 times x plus 7 equals n. I tried working this equation but got stuck multiplying 5/6 times x then adding 7.