[1/x + 1/y] / [1/x - 1/y]
= [(y+x) / (xy)] / [(y-x) / (xy)]
= [(x+y) / (xy)] [(xy) / (-(x-y))]
= - (x+y) / (x-y) = 2018
So, (x+y) / (x-y) = -2018
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