12=3r+3

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Solution for 12=3r+3 equation: 



12=3r+3

We move all terms to the left:

12-(3r+3)=0

We get rid of parentheses

-3r-3+12=0

We add all the numbers together, and all the variables

-3r+9=0

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

-3r=-9

r=-9/-3

r=+3

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