3/7=21/n

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Solution for 3/7=21/n equation: 



3/7=21/n

We move all terms to the left:

3/7-(21/n)=0



Domain of the equation: n)!=0

n!=0/1

n!=0

n∈R



We add all the numbers together, and all the variables

-(+21/n)+3/7=0

We get rid of parentheses

-21/n+3/7=0

We calculate fractions

There is no solution for this equation

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