exam Maths Puzzle Numerical Ability

5/10x + 1/14y = 3 -1/5x + 3/7y = 2

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exam Other Question

(2p-5q)+(3p+6q)+(p-q) i tried this problem on my worksheet and only got half credit, though im not sure why... please explain/show work to me ):

[(2/x)-3] / 1-1/x-1