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If (x+y)/(xy)=7 and (3x+4y)/(xy)=25, the...

If `(x+y)/(xy)=7` and `(3x+4y)/(xy)=25`, then what is the value of `xy` ?

A

`(1)/(7)`

B

`(1)/(9)`

C

`(1)/(12)`

D

`(1)/(18)`

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