21=42/b

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Solution for 21=42/b equation: 



21=42/b

We move all terms to the left:

21-(42/b)=0



Domain of the equation: b)!=0

b!=0/1

b!=0

b∈R



We add all the numbers together, and all the variables

-(+42/b)+21=0

We get rid of parentheses

-42/b+21=0

We multiply all the terms by the denominator


21*b-42=0

We add all the numbers together, and all the variables

21b-42=0

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

21b=42

b=42/21

b=2

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