9/15=21/x

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Solution for 9/15=21/x equation: 



9/15=21/x

We move all terms to the left:

9/15-(21/x)=0



Domain of the equation: x)!=0

x!=0/1

x!=0

x∈R



We add all the numbers together, and all the variables

-(+21/x)+9/15=0

We get rid of parentheses

-21/x+9/15=0

We calculate fractions

There is no solution for this equation

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