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12+n=4n-6
We move all terms to the left:
12+n-(4n-6)=0
We get rid of parentheses
n-4n+6+12=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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