exam Maths Puzzle Numerical Ability

How to simplify this?
3/(x^3+3x^2-x-3)-2/(x^3-x^2-3x+3)+4/(x^3+x^2-3x-3)

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exam Other Question

L has y-intercept (0, -3) and is parallel to the line with equation y=2/3x+1. A 34% acid solution was mixed with a 66% acid solution to produce 216 liters of a 42% acid solution. How much liters of each solution was mixed?