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3^(x-4)=(3^3)^x+28
We move all terms to the left:
3^(x-4)-((3^3)^x+28)=0
We get rid of parentheses
3^(x-4)-3^3^x-28=0
We move all terms containing x to the left, all other terms to the right
3^(x-4)-3^3^x=28
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