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