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6n-18=3n+27
We move all terms to the left:
6n-18-(3n+27)=0
We get rid of parentheses
6n-3n-27-18=0
We add all the numbers together, and all the variables
3n-45=0
We move all terms containing n to the left, all other terms to the right
3n=45
n=45/3
n=15
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