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If 3 ^( x + y) = 81 and 81 ^( x - y) = 3...

If `3 ^( x + y) = 81 and 81 ^( x - y) = 3,` then the value of `x/y` is:

A

`17//16`

B

`17//8`

C

`17//4`

D

`15//4`

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