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-6n-2(4n+8)=40-7n
We move all terms to the left:
-6n-2(4n+8)-(40-7n)=0
We add all the numbers together, and all the variables
-6n-2(4n+8)-(-7n+40)=0
We multiply parentheses
-6n-8n-(-7n+40)-16=0
We get rid of parentheses
-6n-8n+7n-40-16=0
We add all the numbers together, and all the variables
-7n-56=0
We move all terms containing n to the left, all other terms to the right
-7n=56
n=56/-7
n=-8
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