-21=-9r-3

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Solution for -21=-9r-3 equation: 



-21=-9r-3

We move all terms to the left:

-21-(-9r-3)=0

We get rid of parentheses

9r+3-21=0

We add all the numbers together, and all the variables

9r-18=0

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

9r=18

r=18/9

r=2

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