-r-9=r+9

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Solution for -r-9=r+9 equation: 



-r-9=r+9

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

-1r-r-9-9=0

We add all the numbers together, and all the variables

-2r-18=0

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

-2r=18

r=18/-2

r=-9

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