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4(3n-3)=12
We move all terms to the left:
4(3n-3)-(12)=0
We multiply parentheses
12n-12-12=0
We add all the numbers together, and all the variables
12n-24=0
We move all terms containing n to the left, all other terms to the right
12n=24
n=24/12
n=2
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