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6n+6=3n+27
We move all terms to the left:
6n+6-(3n+27)=0
We get rid of parentheses
6n-3n-27+6=0
We add all the numbers together, and all the variables
3n-21=0
We move all terms containing n to the left, all other terms to the right
3n=21
n=21/3
n=7
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