3=r/7

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Solution for 3=r/7 equation: 



3=r/7

We move all terms to the left:

3-(r/7)=0

We add all the numbers together, and all the variables

-(+r/7)+3=0

We get rid of parentheses

-r/7+3=0

We multiply all the terms by the denominator


-r+3*7=0

We add all the numbers together, and all the variables

-1r+21=0

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

-r=-21

r=-21/-1

r=+21

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