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3+6n=3n-4
We move all terms to the left:
3+6n-(3n-4)=0
We get rid of parentheses
6n-3n+4+3=0
We add all the numbers together, and all the variables
3n+7=0
We move all terms containing n to the left, all other terms to the right
3n=-7
n=-7/3
n=-2+1/3
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