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Solve (20)/(x + y) + (3)/(x - y) = 7 a...

Solve `(20)/(x + y) + (3)/(x - y) = 7` and `(8)/(x - y)- (15)/(x + y) = 5`.

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To solve the equations \[ \frac{20}{x+y} + \frac{3}{x-y} = 7 \] and ...
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