9=-3-3-r

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Solution for 9=-3-3-r equation: 



9=-3-3-r

We move all terms to the left:

9-(-3-3-r)=0

We add all the numbers together, and all the variables

-(-1r-6)+9=0

We get rid of parentheses

1r+6+9=0

We add all the numbers together, and all the variables

r+15=0

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

r=-15

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