r-1,2=2r

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Solution for r-1,2=2r equation: 



r-1.2=2r

We move all terms to the left:

r-1.2-(2r)=0

We add all the numbers together, and all the variables

-1r-1.2=0

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

-r=1.2

r=1.2/-1

r=-1+0.2/1

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