-9=-6+r

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Solution for -9=-6+r equation: 



-9=-6+r

We move all terms to the left:

-9-(-6+r)=0

We add all the numbers together, and all the variables

-(r-6)-9=0

We get rid of parentheses

-r+6-9=0

We add all the numbers together, and all the variables

-1r-3=0

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

-r=3

r=3/-1

r=-3

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