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12(3x+1)=120
We move all terms to the left:
12(3x+1)-(120)=0
We multiply parentheses
36x+12-120=0
We add all the numbers together, and all the variables
36x-108=0
We move all terms containing x to the left, all other terms to the right
36x=108
x=108/36
x=3
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