3=3r-9

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Solution for 3=3r-9 equation: 



3=3r-9

We move all terms to the left:

3-(3r-9)=0

We get rid of parentheses

-3r+9+3=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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