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31=8n+
We move all terms to the left:
31-(8n+)=0
We add all the numbers together, and all the variables
-(+8n)+31=0
We get rid of parentheses
-8n+31=0
We move all terms containing n to the left, all other terms to the right
-8n=-31
n=-31/-8
n=3+7/8
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