12=3r+9r

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Solution for 12=3r+9r equation: 



12=3r+9r

We move all terms to the left:

12-(3r+9r)=0

We add all the numbers together, and all the variables

-(+12r)+12=0

We get rid of parentheses

-12r+12=0

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

-12r=-12

r=-12/-12

r=1

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