12=x+(-9)

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



12=x+(-9)

We move all terms to the left:

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



We calculate terms in parentheses: -(x+(-9)), so:

x+(-9)

We add all the numbers together, and all the variables

x-9

Back to the equation:

-(x-9)



We get rid of parentheses

-x+9+12=0

We add all the numbers together, and all the variables

-1x+21=0

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

-x=-21

x=-21/-1

x=+21

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