7=21/y

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Solution for 7=21/y equation: 



7=21/y

We move all terms to the left:

7-(21/y)=0



Domain of the equation: y)!=0

y!=0/1

y!=0

y∈R



We add all the numbers together, and all the variables

-(+21/y)+7=0

We get rid of parentheses

-21/y+7=0

We multiply all the terms by the denominator


7*y-21=0

We add all the numbers together, and all the variables

7y-21=0

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

7y=21

y=21/7

y=3

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