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4n+8(n+5)=124
We move all terms to the left:
4n+8(n+5)-(124)=0
We multiply parentheses
4n+8n+40-124=0
We add all the numbers together, and all the variables
12n-84=0
We move all terms containing n to the left, all other terms to the right
12n=84
n=84/12
n=7
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