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2(3n+6)=411
We move all terms to the left:
2(3n+6)-(411)=0
We multiply parentheses
6n+12-411=0
We add all the numbers together, and all the variables
6n-399=0
We move all terms containing n to the left, all other terms to the right
6n=399
n=399/6
n=66+1/2
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