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6n+6(3n+7)=138
We move all terms to the left:
6n+6(3n+7)-(138)=0
We multiply parentheses
6n+18n+42-138=0
We add all the numbers together, and all the variables
24n-96=0
We move all terms containing n to the left, all other terms to the right
24n=96
n=96/24
n=4
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