exam Maths Puzzle Numerical Ability

2(x + 3) - 4 = 12 + (x - 3)

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exam Other Question

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One number is 11 less than a second number. Twice the second number is 52 more than 4 times the first. Find the two numbers. I am trying to work out how to go about finding the eact value of
tan(sin^-1(-4/5)