r-12=3r-6

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



r-12=3r-6

We move all terms to the left:

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

We get rid of parentheses

r-3r+6-12=0

We add all the numbers together, and all the variables

-2r-6=0

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

-2r=6

r=6/-2

r=-3

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