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3n-12=10n+2
We move all terms to the left:
3n-12-(10n+2)=0
We get rid of parentheses
3n-10n-2-12=0
We add all the numbers together, and all the variables
-7n-14=0
We move all terms containing n to the left, all other terms to the right
-7n=14
n=14/-7
n=-2
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