\frac { 9 ^ { n } ( 3 ^ { 2 } ) ( 3 ^ { \frac { - n } { 2 } } ) ^ { - – InterviewSolution

1.	\frac { 9 ^ { n } ( 3 ^ { 2 } ) ( 3 ^ { \frac { - n } { 2 } } ) ^ { - 2 } - 27 ^ { n } } { 3 ^ { 3 m } \times ( 2 ^ { 3 } ) } = \frac { 1 } { 27 } , \text { then find the value of } m - n
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