21=x-(-9)

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Solution for 21=x-(-9) equation: 



21=x-(-9)

We move all terms to the left:

21-(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+21=0

We add all the numbers together, and all the variables

-1x+12=0

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

-x=-12

x=-12/-1

x=+12

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