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9n+24=12n+3
We move all terms to the left:
9n+24-(12n+3)=0
We get rid of parentheses
9n-12n-3+24=0
We add all the numbers together, and all the variables
-3n+21=0
We move all terms containing n to the left, all other terms to the right
-3n=-21
n=-21/-3
n=+7
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