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-12n-4(-5n+7)=108
We move all terms to the left:
-12n-4(-5n+7)-(108)=0
We multiply parentheses
-12n+20n-28-108=0
We add all the numbers together, and all the variables
8n-136=0
We move all terms containing n to the left, all other terms to the right
8n=136
n=136/8
n=17
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