r/5=9/21

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Solution for r/5=9/21 equation: 



r/5=9/21

We move all terms to the left:

r/5-(9/21)=0

We add all the numbers together, and all the variables

r/5-(+9/21)=0

We get rid of parentheses

r/5-9/21=0

We calculate fractions

There is no solution for this equation

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