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3n-40=6n+8
We move all terms to the left:
3n-40-(6n+8)=0
We get rid of parentheses
3n-6n-8-40=0
We add all the numbers together, and all the variables
-3n-48=0
We move all terms containing n to the left, all other terms to the right
-3n=48
n=48/-3
n=-16
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