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-6=0

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

-3r=6

r=6/-3

r=-2

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