21/b-1=9/3

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Solution for 21/b-1=9/3 equation: 



21/b-1=9/3

We move all terms to the left:

21/b-1-(9/3)=0



Domain of the equation: b!=0

b∈R



We add all the numbers together, and all the variables

21/b-1-3=0

We add all the numbers together, and all the variables

21/b-4=0

We multiply all the terms by the denominator


-4*b+21=0

We add all the numbers together, and all the variables

-4b+21=0

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

-4b=-21

b=-21/-4

b=5+1/4

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