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4n+2(n-3)=66
We move all terms to the left:
4n+2(n-3)-(66)=0
We multiply parentheses
4n+2n-6-66=0
We add all the numbers together, and all the variables
6n-72=0
We move all terms containing n to the left, all other terms to the right
6n=72
n=72/6
n=12
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