n-n+4n+3n-n=12

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Solution for n-n+4n+3n-n=12 equation: 



n-n+4n+3n-n=12

We move all terms to the left:

n-n+4n+3n-n-(12)=0

We add all the numbers together, and all the variables

6n-12=0

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

6n=12

n=12/6

n=2

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