-9r-1=-9-8r

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



-9r-1=-9-8r

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

-9r+8r+9-1=0

We add all the numbers together, and all the variables

-1r+8=0

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

-r=-8

r=-8/-1

r=+8

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