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6n=+30+3n-12
We move all terms to the left:
6n-(+30+3n-12)=0
We add all the numbers together, and all the variables
6n-(3n+18)=0
We get rid of parentheses
6n-3n-18=0
We add all the numbers together, and all the variables
3n-18=0
We move all terms containing n to the left, all other terms to the right
3n=18
n=18/3
n=6
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