8=r-20

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Solution for 8=r-20 equation: 



8=r-20

We move all terms to the left:

8-(r-20)=0

We get rid of parentheses

-r+20+8=0

We add all the numbers together, and all the variables

-1r+28=0

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

-r=-28

r=-28/-1

r=+28

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