21=x-(-12)

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Solution for 21=x-(-12) equation: 



21=x-(-12)

We move all terms to the left:

21-(x-(-12))=0



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

x-(-12)

We add all the numbers together, and all the variables

x+12

Back to the equation:

-(x+12)



We get rid of parentheses

-x-12+21=0

We add all the numbers together, and all the variables

-1x+9=0

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

-x=-9

x=-9/-1

x=+9

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