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4(5n+7)=108
We move all terms to the left:
4(5n+7)-(108)=0
We multiply parentheses
20n+28-108=0
We add all the numbers together, and all the variables
20n-80=0
We move all terms containing n to the left, all other terms to the right
20n=80
n=80/20
n=4
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