12+5r=2r-r

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Solution for 12+5r=2r-r equation: 



12+5r=2r-r

We move all terms to the left:

12+5r-(2r-r)=0

We add all the numbers together, and all the variables

5r-(+r)+12=0

We get rid of parentheses

5r-r+12=0

We add all the numbers together, and all the variables

4r+12=0

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

4r=-12

r=-12/4

r=-3

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