21=r-(-12)

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



21=r-(-12)

We move all terms to the left:

21-(r-(-12))=0



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

r-(-12)

We add all the numbers together, and all the variables

r+12

Back to the equation:

-(r+12)



We get rid of parentheses

-r-12+21=0

We add all the numbers together, and all the variables

-1r+9=0

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

-r=-9

r=-9/-1

r=+9

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