12=6r-9r

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Solution for 12=6r-9r equation: 



12=6r-9r

We move all terms to the left:

12-(6r-9r)=0

We add all the numbers together, and all the variables

-(-3r)+12=0

We get rid of parentheses

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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