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12x+8=3x+116
We move all terms to the left:
12x+8-(3x+116)=0
We get rid of parentheses
12x-3x-116+8=0
We add all the numbers together, and all the variables
9x-108=0
We move all terms containing x to the left, all other terms to the right
9x=108
x=108/9
x=12
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