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12n-4=10n+19
We move all terms to the left:
12n-4-(10n+19)=0
We get rid of parentheses
12n-10n-19-4=0
We add all the numbers together, and all the variables
2n-23=0
We move all terms containing n to the left, all other terms to the right
2n=23
n=23/2
n=11+1/2
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