27=r+20

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Solution for 27=r+20 equation: 



27=r+20

We move all terms to the left:

27-(r+20)=0

We get rid of parentheses

-r-20+27=0

We add all the numbers together, and all the variables

-1r+7=0

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

-r=-7

r=-7/-1

r=+7

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