9=10r-r

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Solution for 9=10r-r equation: 



9=10r-r

We move all terms to the left:

9-(10r-r)=0

We add all the numbers together, and all the variables

-(+9r)+9=0

We get rid of parentheses

-9r+9=0

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

-9r=-9

r=-9/-9

r=1

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