-2r-9=-9-2r

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Solution for -2r-9=-9-2r equation: 



-2r-9=-9-2r

We move all terms to the left:

-2r-9-(-9-2r)=0

We add all the numbers together, and all the variables

-2r-(-2r-9)-9=0

We get rid of parentheses

-2r+2r+9-9=0

We add all the numbers together, and all the variables

=0

r=0/1

r=0

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