-21+-3r=-57

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Solution for -21+-3r=-57 equation: 



-21+-3r=-57

We move all terms to the left:

-21+-3r-(-57)=0

We add all the numbers together, and all the variables

-3r+36=0

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

-3r=-36

r=-36/-3

r=+12

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