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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