3=9-3r

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Solution for 3=9-3r equation: 



3=9-3r

We move all terms to the left:

3-(9-3r)=0

We add all the numbers together, and all the variables

-(-3r+9)+3=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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