exam Maths Puzzle Numerical Ability

hello, i need some help to simplify and reduce to lowest terms

1/(x+5y)-5/(x-5y)+3/(x^2-25y^2)

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exam Other Question

how do you do partial fraction decomposition?? Like on a problem such as: 1/(x^2+x)??? What quantity of 70 per cent acid solution must be mixed with a 20 percent solution to produce 700 mL of a 50 per cent solution?