r=8r+(-9)

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Solution for r=8r+(-9) equation: 



r=8r+(-9)

We move all terms to the left:

r-(8r+(-9))=0



We calculate terms in parentheses: -(8r+(-9)), so:

8r+(-9)

We add all the numbers together, and all the variables

8r-9

Back to the equation:

-(8r-9)



We get rid of parentheses

r-8r+9=0

We add all the numbers together, and all the variables

-7r+9=0

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

-7r=-9

r=-9/-7

r=1+2/7

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