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8(n-9)+4n=0
We add all the numbers together, and all the variables
4n+8(n-9)=0
We multiply parentheses
4n+8n-72=0
We add all the numbers together, and all the variables
12n-72=0
We move all terms containing n to the left, all other terms to the right
12n=72
n=72/12
n=6
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