book Maths Puzzle Numerical Ability

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How can I solve y=2x -3

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how would one solve: -X - Y = -7XY

+ Y + Z = 6YZ
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it is part of a long problem that
Perform the indicated operations. Simplify the result.

(x-11/2x + 10) / (x^2 - 8x - 33/x + 5) * (x + 3/x^2)