10r-9=191

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Solution for 10r-9=191 equation: 



10r-9=191

We move all terms to the left:

10r-9-(191)=0

We add all the numbers together, and all the variables

10r-200=0

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

10r=200

r=200/10

r=20

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