-9=r+3-7r

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Solution for -9=r+3-7r equation: 



-9=r+3-7r

We move all terms to the left:

-9-(r+3-7r)=0

We add all the numbers together, and all the variables

-(-6r+3)-9=0

We get rid of parentheses

6r-3-9=0

We add all the numbers together, and all the variables

6r-12=0

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

6r=12

r=12/6

r=2

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