12n-n-9n-n=9

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Solution for 12n-n-9n-n=9 equation: 



12n-n-9n-n=9

We move all terms to the left:

12n-n-9n-n-(9)=0

We add all the numbers together, and all the variables

n-9=0

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

n=9

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