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3+3(4n-3)=66
We move all terms to the left:
3+3(4n-3)-(66)=0
We add all the numbers together, and all the variables
3(4n-3)-63=0
We multiply parentheses
12n-9-63=0
We add all the numbers together, and all the variables
12n-72=0
We move all terms containing n to the left, all other terms to the right
12n=72
n=72/12
n=6
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