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4n+12=10n-30
We move all terms to the left:
4n+12-(10n-30)=0
We get rid of parentheses
4n-10n+30+12=0
We add all the numbers together, and all the variables
-6n+42=0
We move all terms containing n to the left, all other terms to the right
-6n=-42
n=-42/-6
n=+7
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