21-4r=-27

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Solution for 21-4r=-27 equation: 



21-4r=-27

We move all terms to the left:

21-4r-(-27)=0

We add all the numbers together, and all the variables

-4r+48=0

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

-4r=-48

r=-48/-4

r=+12

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