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