18=-5r-4r

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Solution for 18=-5r-4r equation: 



18=-5r-4r

We move all terms to the left:

18-(-5r-4r)=0

We add all the numbers together, and all the variables

-(-9r)+18=0

We get rid of parentheses

9r+18=0

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

9r=-18

r=-18/9

r=-2

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