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6n+6(2n+8)=120
We move all terms to the left:
6n+6(2n+8)-(120)=0
We multiply parentheses
6n+12n+48-120=0
We add all the numbers together, and all the variables
18n-72=0
We move all terms containing n to the left, all other terms to the right
18n=72
n=72/18
n=4
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