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