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(x + y) / (x-1 + y-1) = (x + y) divided by ( 1/x + 1/y)

Multiply numerator and denominator by 'xy' :

xy (x + y) / (y + x)

Then the whole thing falls apart, and we're left with:

xy
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12y ago
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Q: How do you simplify x plus y all over x ALL OVER x to the negative 1 plus y to the negative 1?
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