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3+3(3n-1)=63
We move all terms to the left:
3+3(3n-1)-(63)=0
We add all the numbers together, and all the variables
3(3n-1)-60=0
We multiply parentheses
9n-3-60=0
We add all the numbers together, and all the variables
9n-63=0
We move all terms containing n to the left, all other terms to the right
9n=63
n=63/9
n=7
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