12=2r-8

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Solution for 12=2r-8 equation: 



12=2r-8

We move all terms to the left:

12-(2r-8)=0

We get rid of parentheses

-2r+8+12=0

We add all the numbers together, and all the variables

-2r+20=0

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

-2r=-20

r=-20/-2

r=+10

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