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84=4+8n
We move all terms to the left:
84-(4+8n)=0
We add all the numbers together, and all the variables
-(8n+4)+84=0
We get rid of parentheses
-8n-4+84=0
We add all the numbers together, and all the variables
-8n+80=0
We move all terms containing n to the left, all other terms to the right
-8n=-80
n=-80/-8
n=+10
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