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24=3n+9n
We move all terms to the left:
24-(3n+9n)=0
We add all the numbers together, and all the variables
-(+12n)+24=0
We get rid of parentheses
-12n+24=0
We move all terms containing n to the left, all other terms to the right
-12n=-24
n=-24/-12
n=+2
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