21-3r=12

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Solution for 21-3r=12 equation: 



21-3r=12

We move all terms to the left:

21-3r-(12)=0

We add all the numbers together, and all the variables

-3r+9=0

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

-3r=-9

r=-9/-3

r=+3

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