21=3r-3

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Solution for 21=3r-3 equation: 



21=3r-3

We move all terms to the left:

21-(3r-3)=0

We get rid of parentheses

-3r+3+21=0

We add all the numbers together, and all the variables

-3r+24=0

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

-3r=-24

r=-24/-3

r=+8

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