9=3r-3

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Solution for 9=3r-3 equation: 



9=3r-3

We move all terms to the left:

9-(3r-3)=0

We get rid of parentheses

-3r+3+9=0

We add all the numbers together, and all the variables

-3r+12=0

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

-3r=-12

r=-12/-3

r=+4

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