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4(3^x+1)=108
We move all terms to the left:
4(3^x+1)-(108)=0
We multiply parentheses
12x+4-108=0
We add all the numbers together, and all the variables
12x-104=0
We move all terms containing x to the left, all other terms to the right
12x=104
x=104/12
x=8+2/3
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