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3^x+2=648+3^x
We move all terms to the left:
3^x+2-(648+3^x)=0
We get rid of parentheses
3^x-3^x-648+2=0
We add all the numbers together, and all the variables
3^x-3^x-646=0
We move all terms containing x to the left, all other terms to the right
3^x-3^x=646
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