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8n+1=5-n+8n
We move all terms to the left:
8n+1-(5-n+8n)=0
We add all the numbers together, and all the variables
8n-(7n+5)+1=0
We get rid of parentheses
8n-7n-5+1=0
We add all the numbers together, and all the variables
n-4=0
We move all terms containing n to the left, all other terms to the right
n=4
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