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3(6x+3)-12=105
We move all terms to the left:
3(6x+3)-12-(105)=0
We add all the numbers together, and all the variables
3(6x+3)-117=0
We multiply parentheses
18x+9-117=0
We add all the numbers together, and all the variables
18x-108=0
We move all terms containing x to the left, all other terms to the right
18x=108
x=108/18
x=6
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