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