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3(3^x+2+3^x-1)=84
We move all terms to the left:
3(3^x+2+3^x-1)-(84)=0
We multiply parentheses
9x+9x+6-3-84=0
We add all the numbers together, and all the variables
18x-81=0
We move all terms containing x to the left, all other terms to the right
18x=81
x=81/18
x=4+1/2
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