21-3r=9

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Solution for 21-3r=9 equation: 



21-3r=9

We move all terms to the left:

21-3r-(9)=0

We add all the numbers together, and all the variables

-3r+12=0

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

-3r=-12

r=-12/-3

r=+4

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