9+r=-4r

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Solution for 9+r=-4r equation: 



9+r=-4r

We move all terms to the left:

9+r-(-4r)=0

We get rid of parentheses

r+4r+9=0

We add all the numbers together, and all the variables

5r+9=0

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

5r=-9

r=-9/5

r=-1+4/5

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