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3x-4=12x-122
We move all terms to the left:
3x-4-(12x-122)=0
We get rid of parentheses
3x-12x+122-4=0
We add all the numbers together, and all the variables
-9x+118=0
We move all terms containing x to the left, all other terms to the right
-9x=-118
x=-118/-9
x=13+1/9
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