-9+7r=-9+r

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



-9+7r=-9+r

We move all terms to the left:

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

We add all the numbers together, and all the variables

7r-(r-9)-9=0

We get rid of parentheses

7r-r+9-9=0

We add all the numbers together, and all the variables

6r=0

r=0/6

r=0

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