9+9r=-90

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Solution for 9+9r=-90 equation: 



9+9r=-90

We move all terms to the left:

9+9r-(-90)=0

We add all the numbers together, and all the variables

9r+99=0

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

9r=-99

r=-99/9

r=-11

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