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12=3n+1
We move all terms to the left:
12-(3n+1)=0
We get rid of parentheses
-3n-1+12=0
We add all the numbers together, and all the variables
-3n+11=0
We move all terms containing n to the left, all other terms to the right
-3n=-11
n=-11/-3
n=3+2/3
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