50/x+y=40/x-y and solve for x

50/x+y=40/x-y

so : 50(x - y) = 40(x + y)

so : 50x - 50y = 40x + 40y

so : 50x - 40x = 50y + 40y

so : 10x = 90y

so : x = 9y

Good luck

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