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9x+12=3x+120
We move all terms to the left:
9x+12-(3x+120)=0
We get rid of parentheses
9x-3x-120+12=0
We add all the numbers together, and all the variables
6x-108=0
We move all terms containing x to the left, all other terms to the right
6x=108
x=108/6
x=18
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