20=-2+2r

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Solution for 20=-2+2r equation: 



20=-2+2r

We move all terms to the left:

20-(-2+2r)=0

We add all the numbers together, and all the variables

-(2r-2)+20=0

We get rid of parentheses

-2r+2+20=0

We add all the numbers together, and all the variables

-2r+22=0

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

-2r=-22

r=-22/-2

r=+11

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