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6n=3n-12
We move all terms to the left:
6n-(3n-12)=0
We get rid of parentheses
6n-3n+12=0
We add all the numbers together, and all the variables
3n+12=0
We move all terms containing n to the left, all other terms to the right
3n=-12
n=-12/3
n=-4
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