9=-3-3r

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Solution for 9=-3-3r equation: 



9=-3-3r

We move all terms to the left:

9-(-3-3r)=0

We add all the numbers together, and all the variables

-(-3r-3)+9=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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