4/7=r/21

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Solution for 4/7=r/21 equation: 



4/7=r/21

We move all terms to the left:

4/7-(r/21)=0

We add all the numbers together, and all the variables

-(+r/21)+4/7=0

We get rid of parentheses

-r/21+4/7=0

We calculate fractions

There is no solution for this equation

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