3=21/r

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Solution for 3=21/r equation: 



3=21/r

We move all terms to the left:

3-(21/r)=0



Domain of the equation: r)!=0

r!=0/1

r!=0

r∈R



We add all the numbers together, and all the variables

-(+21/r)+3=0

We get rid of parentheses

-21/r+3=0

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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