12-3r=-6r

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Solution for 12-3r=-6r equation: 



12-3r=-6r

We move all terms to the left:

12-3r-(-6r)=0

We get rid of parentheses

-3r+6r+12=0

We add all the numbers together, and all the variables

3r+12=0

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

3r=-12

r=-12/3

r=-4

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