2r+9=-9-4r

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



2r+9=-9-4r

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

2r+4r+9+9=0

We add all the numbers together, and all the variables

6r+18=0

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

6r=-18

r=-18/6

r=-3

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