![\left. \begin{array} { l } { ( \frac { 64 } { 343 } ) ( \frac { 343 } { 64 } ) ^ { - x } = [ \frac { 49 } { 16 } ] ^ { 2 x - 1 } } \end{array} \right.](https://tex.z-dn.net/?f=%5Cleft.+%5Cbegin%7Barray%7D+%7B+l+%7D+%7B+%28+%5Cfrac+%7B+64+%7D+%7B+343+%7D+%29+%28+%5Cfrac+%7B+343+%7D+%7B+64+%7D+%29+%5E+%7B+-+x+%7D+%3D+%5B+%5Cfrac+%7B+49+%7D+%7B+16+%7D+%5D+%5E+%7B+2+x+-+1+%7D+%7D+%5Cend%7Barray%7D+%5Cright. "\left. \begin{array} { l } { ( \frac { 64 } { 343 } ) ( \frac { 343 } { 64 } ) ^ { - x } = [ \frac { 49 } { 16 } ] ^ { 2 x - 1 } } \end{array} \right.")
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x = -1/5 is the answer you need
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