12-0.5r=2r-1

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Solution for 12-0.5r=2r-1 equation: 



12-0.5r=2r-1

We move all terms to the left:

12-0.5r-(2r-1)=0

We get rid of parentheses

-0.5r-2r+1+12=0

We add all the numbers together, and all the variables

-2.5r+13=0

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

-2.5r=-13

r=-13/-2.5

r=5+0.5/2.5

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