12=5r-8

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Solution for 12=5r-8 equation: 



12=5r-8

We move all terms to the left:

12-(5r-8)=0

We get rid of parentheses

-5r+8+12=0

We add all the numbers together, and all the variables

-5r+20=0

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

-5r=-20

r=-20/-5

r=+4

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