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9^m+3^(3-2m)=28
We move all terms to the left:
9^m+3^(3-2m)-(28)=0
We add all the numbers together, and all the variables
9^m+3^(-2m+3)-28=0
We move all terms containing m to the left, all other terms to the right
9^m+3^(-2m+3)=28
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