9=n+(-12)

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



9=n+(-12)

We move all terms to the left:

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



We calculate terms in parentheses: -(n+(-12)), so:

n+(-12)

We add all the numbers together, and all the variables

n-12

Back to the equation:

-(n-12)



We get rid of parentheses

-n+12+9=0

We add all the numbers together, and all the variables

-1n+21=0

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

-n=-21

n=-21/-1

n=+21

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