18=-4r-8r

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Solution for 18=-4r-8r equation: 



18=-4r-8r

We move all terms to the left:

18-(-4r-8r)=0

We add all the numbers together, and all the variables

-(-12r)+18=0

We get rid of parentheses

12r+18=0

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

12r=-18

r=-18/12

r=-1+1/2

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