-1=9r-8r

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Solution for -1=9r-8r equation: 



-1=9r-8r

We move all terms to the left:

-1-(9r-8r)=0

We add all the numbers together, and all the variables

-(+r)-1=0

We get rid of parentheses

-r-1=0

We add all the numbers together, and all the variables

-1r-1=0

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

-r=1

r=1/-1

r=-1

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