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2+(3n-4)=19
We move all terms to the left:
2+(3n-4)-(19)=0
We add all the numbers together, and all the variables
(3n-4)-17=0
We get rid of parentheses
3n-4-17=0
We add all the numbers together, and all the variables
3n-21=0
We move all terms containing n to the left, all other terms to the right
3n=21
n=21/3
n=7
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