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6x+3=12x+12
We move all terms to the left:
6x+3-(12x+12)=0
We get rid of parentheses
6x-12x-12+3=0
We add all the numbers together, and all the variables
-6x-9=0
We move all terms containing x to the left, all other terms to the right
-6x=9
x=9/-6
x=-1+1/2
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