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36=9n+3n
We move all terms to the left:
36-(9n+3n)=0
We add all the numbers together, and all the variables
-(+12n)+36=0
We get rid of parentheses
-12n+36=0
We move all terms containing n to the left, all other terms to the right
-12n=-36
n=-36/-12
n=+3
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