-r-9=-4r

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Solution for -r-9=-4r equation: 



-r-9=-4r

We move all terms to the left:

-r-9-(-4r)=0

We add all the numbers together, and all the variables

-1r-(-4r)-9=0

We get rid of parentheses

-1r+4r-9=0

We add all the numbers together, and all the variables

3r-9=0

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

3r=9

r=9/3

r=3

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