9r-1=9+10r

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Solution for 9r-1=9+10r equation: 



9r-1=9+10r

We move all terms to the left:

9r-1-(9+10r)=0

We add all the numbers together, and all the variables

9r-(10r+9)-1=0

We get rid of parentheses

9r-10r-9-1=0

We add all the numbers together, and all the variables

-1r-10=0

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

-r=10

r=10/-1

r=-10

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