-21=3/5b

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Solution for -21=3/5b equation: 



-21=3/5b

We move all terms to the left:

-21-(3/5b)=0



Domain of the equation: 5b)!=0

b!=0/1

b!=0

b∈R



We add all the numbers together, and all the variables

-(+3/5b)-21=0

We get rid of parentheses

-3/5b-21=0

We multiply all the terms by the denominator


-21*5b-3=0

Wy multiply elements

-105b-3=0

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

-105b=3

b=3/-105

b=-1/35

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