\left\{ \begin{array} { l } { \log _ { 4 } ( x + y ) = 2 } \\ { \log _ { 3 } x + \log _ { 3 } y = 2 + \log _ { 3 } 7 } \end{array} \right.
Solve for x, y
x=9\text{, }y=7
x=7\text{, }y=9
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