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8n+1=12n-15
We move all terms to the left:
8n+1-(12n-15)=0
We get rid of parentheses
8n-12n+15+1=0
We add all the numbers together, and all the variables
-4n+16=0
We move all terms containing n to the left, all other terms to the right
-4n=-16
n=-16/-4
n=+4
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