27=r-4

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Solution for 27=r-4 equation: 



27=r-4

We move all terms to the left:

27-(r-4)=0

We get rid of parentheses

-r+4+27=0

We add all the numbers together, and all the variables

-1r+31=0

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

-r=-31

r=-31/-1

r=+31

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