12=2r-6

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Solution for 12=2r-6 equation: 



12=2r-6

We move all terms to the left:

12-(2r-6)=0

We get rid of parentheses

-2r+6+12=0

We add all the numbers together, and all the variables

-2r+18=0

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

-2r=-18

r=-18/-2

r=+9

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