2n+(n-12)=84

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Solution for 2n+(n-12)=84 equation: 



2n+(n-12)=84

We move all terms to the left:

2n+(n-12)-(84)=0

We get rid of parentheses

2n+n-12-84=0

We add all the numbers together, and all the variables

3n-96=0

We move all terms containing n to the left, all other terms to the right

3n=96

n=96/3

n=32

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