9r-91=89

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Solution for 9r-91=89 equation: 



9r-91=89

We move all terms to the left:

9r-91-(89)=0

We add all the numbers together, and all the variables

9r-180=0

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

9r=180

r=180/9

r=20

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