r=9-8r

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Solution for r=9-8r equation: 



r=9-8r

We move all terms to the left:

r-(9-8r)=0

We add all the numbers together, and all the variables

r-(-8r+9)=0

We get rid of parentheses

r+8r-9=0

We add all the numbers together, and all the variables

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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