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2(n-4)+4(1+4n)=-40
We move all terms to the left:
2(n-4)+4(1+4n)-(-40)=0
We add all the numbers together, and all the variables
2(n-4)+4(4n+1)-(-40)=0
We add all the numbers together, and all the variables
2(n-4)+4(4n+1)+40=0
We multiply parentheses
2n+16n-8+4+40=0
We add all the numbers together, and all the variables
18n+36=0
We move all terms containing n to the left, all other terms to the right
18n=-36
n=-36/18
n=-2
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