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Find m so that (-3)^(m+1) xx (-3)^5 = (...

Find `m` so that `(-3)^(m+1) xx (-3)^5 = (-3)^7`

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Given that, `( - 3 )^(m+1)xx (- 3)^5 = ( - 3 )^7`
⇒`( - 3 )^(m+ 1 + 5) = ( - 3 )^7`
⇒`( - 3 )^(m+ 6) = ( - 3 )^7`
...
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