-2r=-9-3r

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Solution for -2r=-9-3r equation: 



-2r=-9-3r

We move all terms to the left:

-2r-(-9-3r)=0

We add all the numbers together, and all the variables

-2r-(-3r-9)=0

We get rid of parentheses

-2r+3r+9=0

We add all the numbers together, and all the variables

r+9=0

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

r=-9

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