27=8r-21

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Solution for 27=8r-21 equation: 



27=8r-21

We move all terms to the left:

27-(8r-21)=0

We get rid of parentheses

-8r+21+27=0

We add all the numbers together, and all the variables

-8r+48=0

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

-8r=-48

r=-48/-8

r=+6

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