-21=8r+3

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Solution for -21=8r+3 equation: 



-21=8r+3

We move all terms to the left:

-21-(8r+3)=0

We get rid of parentheses

-8r-3-21=0

We add all the numbers together, and all the variables

-8r-24=0

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

-8r=24

r=24/-8

r=-3

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