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If 1/x + 1/y = 1/3; 1/x + 1/z = 1/5; 1/y + 1/z = 1/7 then x/y = ??

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If
1/x + 1/y = 1/3
1/x + 1/z = 1/5
1/y + 1/z = 1/7
then
x/y = ??

posted Jun 13, 2015 by anonymous

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