r+7r-9=-9-7r

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



r+7r-9=-9-7r

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

8r-(-7r-9)-9=0

We get rid of parentheses

8r+7r+9-9=0

We add all the numbers together, and all the variables

15r=0

r=0/15

r=0

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