9-n+9=12+9

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



9-n+9=12+9

We move all terms to the left:

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

We add all the numbers together, and all the variables

-n+9+9-21=0

We add all the numbers together, and all the variables

-1n-3=0

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

-n=3

n=3/-1

n=-3

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