21/28=3/x

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Solution for 21/28=3/x equation: 



21/28=3/x

We move all terms to the left:

21/28-(3/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

-(+3/x)+21/28=0

We get rid of parentheses

-3/x+21/28=0

We calculate fractions

There is no solution for this equation

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