n+n-n+2n=12

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



n+n-n+2n=12

We move all terms to the left:

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

We add all the numbers together, and all the variables

3n-12=0

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

3n=12

n=12/3

n=4

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