20=r-2

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Solution for 20=r-2 equation: 



20=r-2

We move all terms to the left:

20-(r-2)=0

We get rid of parentheses

-r+2+20=0

We add all the numbers together, and all the variables

-1r+22=0

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

-r=-22

r=-22/-1

r=+22

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