28=-4r+8r

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Solution for 28=-4r+8r equation: 



28=-4r+8r

We move all terms to the left:

28-(-4r+8r)=0

We add all the numbers together, and all the variables

-(+4r)+28=0

We get rid of parentheses

-4r+28=0

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

-4r=-28

r=-28/-4

r=+7

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