2n-2n+n+n=12

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



2n-2n+n+n=12

We move all terms to the left:

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

We add all the numbers together, and all the variables

2n-12=0

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

2n=12

n=12/2

n=6

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