-9-3r=r-1

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Solution for -9-3r=r-1 equation: 



-9-3r=r-1

We move all terms to the left:

-9-3r-(r-1)=0

We get rid of parentheses

-3r-r+1-9=0

We add all the numbers together, and all the variables

-4r-8=0

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

-4r=8

r=8/-4

r=-2

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