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36=12n-4n
We move all terms to the left:
36-(12n-4n)=0
We add all the numbers together, and all the variables
-(+8n)+36=0
We get rid of parentheses
-8n+36=0
We move all terms containing n to the left, all other terms to the right
-8n=-36
n=-36/-8
n=4+1/2
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