-3r+3=-18

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Solution for -3r+3=-18 equation: 



-3r+3=-18

We move all terms to the left:

-3r+3-(-18)=0

We add all the numbers together, and all the variables

-3r+21=0

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

-3r=-21

r=-21/-3

r=+7

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