18=3r+6r

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Solution for 18=3r+6r equation: 



18=3r+6r

We move all terms to the left:

18-(3r+6r)=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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