r+12-2r=-9-4r

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Solution for r+12-2r=-9-4r equation: 



r+12-2r=-9-4r

We move all terms to the left:

r+12-2r-(-9-4r)=0

We add all the numbers together, and all the variables

r-2r-(-4r-9)+12=0

We add all the numbers together, and all the variables

-1r-(-4r-9)+12=0

We get rid of parentheses

-1r+4r+9+12=0

We add all the numbers together, and all the variables

3r+21=0

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

3r=-21

r=-21/3

r=-7

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