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-4(n-4)+8(7+n)=-n-3n
We move all terms to the left:
-4(n-4)+8(7+n)-(-n-3n)=0
We add all the numbers together, and all the variables
-4(n-4)+8(n+7)-(-4n)=0
We multiply parentheses
-4n+8n-(-4n)+16+56=0
We get rid of parentheses
-4n+8n+4n+16+56=0
We add all the numbers together, and all the variables
8n+72=0
We move all terms containing n to the left, all other terms to the right
8n=-72
n=-72/8
n=-9
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