J12=3r+9r

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Solution for J12=3r+9r equation: 



12=3J+9J

We move all terms to the left:

12-(3J+9J)=0

We add all the numbers together, and all the variables

-(+12J)+12=0

We get rid of parentheses

-12J+12=0

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

-12J=-12

J=-12/-12

J=1

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