21/r=3

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Solution for 21/r=3 equation: 



21/r=3

We move all terms to the left:

21/r-(3)=0



Domain of the equation: r!=0

r∈R



We multiply all the terms by the denominator


-3*r+21=0

We add all the numbers together, and all the variables

-3r+21=0

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

-3r=-21

r=-21/-3

r=+7

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