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12(2n-1)=4
We move all terms to the left:
12(2n-1)-(4)=0
We multiply parentheses
24n-12-4=0
We add all the numbers together, and all the variables
24n-16=0
We move all terms containing n to the left, all other terms to the right
24n=16
n=16/24
n=2/3
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