7=21/x

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Solution for 7=21/x equation: 



7=21/x

We move all terms to the left:

7-(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)+7=0

We get rid of parentheses

-21/x+7=0

We multiply all the terms by the denominator


7*x-21=0

We add all the numbers together, and all the variables

7x-21=0

We move all terms containing x to the left, all other terms to the right

7x=21

x=21/7

x=3

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