9+9r=-18

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Solution for 9+9r=-18 equation: 



9+9r=-18

We move all terms to the left:

9+9r-(-18)=0

We add all the numbers together, and all the variables

9r+27=0

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

9r=-27

r=-27/9

r=-3

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