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3(2n-1)-2(n-4)=19
We move all terms to the left:
3(2n-1)-2(n-4)-(19)=0
We multiply parentheses
6n-2n-3+8-19=0
We add all the numbers together, and all the variables
4n-14=0
We move all terms containing n to the left, all other terms to the right
4n=14
n=14/4
n=3+1/2
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