21=3r-12

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Solution for 21=3r-12 equation: 



21=3r-12

We move all terms to the left:

21-(3r-12)=0

We get rid of parentheses

-3r+12+21=0

We add all the numbers together, and all the variables

-3r+33=0

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

-3r=-33

r=-33/-3

r=+11

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