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39=7+8n
We move all terms to the left:
39-(7+8n)=0
We add all the numbers together, and all the variables
-(8n+7)+39=0
We get rid of parentheses
-8n-7+39=0
We add all the numbers together, and all the variables
-8n+32=0
We move all terms containing n to the left, all other terms to the right
-8n=-32
n=-32/-8
n=+4
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