-9=6r+7+2r

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Solution for -9=6r+7+2r equation: 



-9=6r+7+2r

We move all terms to the left:

-9-(6r+7+2r)=0

We add all the numbers together, and all the variables

-(8r+7)-9=0

We get rid of parentheses

-8r-7-9=0

We add all the numbers together, and all the variables

-8r-16=0

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

-8r=16

r=16/-8

r=-2

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