10r-11=9

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Solution for 10r-11=9 equation: 



10r-11=9

We move all terms to the left:

10r-11-(9)=0

We add all the numbers together, and all the variables

10r-20=0

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

10r=20

r=20/10

r=2

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