n-n-9=12-n

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



n-n-9=12-n

We move all terms to the left:

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

We add all the numbers together, and all the variables

n-n-(-1n+12)-9=0

We add all the numbers together, and all the variables

-(-1n+12)-9=0

We get rid of parentheses

1n-12-9=0

We add all the numbers together, and all the variables

n-21=0

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

n=21

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