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10n+2=7n+12
We move all terms to the left:
10n+2-(7n+12)=0
We get rid of parentheses
10n-7n-12+2=0
We add all the numbers together, and all the variables
3n-10=0
We move all terms containing n to the left, all other terms to the right
3n=10
n=10/3
n=3+1/3
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