n+2n+n=12

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Solution for n+2n+n=12 equation: 



n+2n+n=12

We move all terms to the left:

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

We add all the numbers together, and all the variables

4n-12=0

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

4n=12

n=12/4

n=3

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