21=r+(-7)

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Solution for 21=r+(-7) equation: 



21=r+(-7)

We move all terms to the left:

21-(r+(-7))=0



We calculate terms in parentheses: -(r+(-7)), so:

r+(-7)

We add all the numbers together, and all the variables

r-7

Back to the equation:

-(r-7)



We get rid of parentheses

-r+7+21=0

We add all the numbers together, and all the variables

-1r+28=0

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

-r=-28

r=-28/-1

r=+28

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