If $3^{x+y}$=81 and $81^{x-y}$=3, then the value of x is

If $3^{x+y}$=81 and $81^{x-y}$=3, then the value of x is
1). 42
2). $\frac{15}{8}$
3). $\frac{17}{8}$
4). 39

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