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simplify [(y/(x+10+y))*(x/(x+y))]/ [[(x/(x+y))*(y/(x+10+y))]+[(y/(x+y))*(y/(y+10+x))]]
simplify [(y/(x+10+y))*(x/(x+y))]/ [[(x/(x+y))*(y/(x+10+y))]+[(y/(x+y))*(y/(y+10+x))]]
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