r+-2r=-3

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Solution for r+-2r=-3 equation: 



r+-2r=-3

We move all terms to the left:

r+-2r-(-3)=0

We add all the numbers together, and all the variables

-1r+3=0

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

-r=-3

r=-3/-1

r=+3

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