-21=-9+2/3b

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Solution for -21=-9+2/3b equation: 



-21=-9+2/3b

We move all terms to the left:

-21-(-9+2/3b)=0



Domain of the equation: 3b)!=0

b!=0/1

b!=0

b∈R



We add all the numbers together, and all the variables

-(2/3b-9)-21=0

We get rid of parentheses

-2/3b+9-21=0

We multiply all the terms by the denominator


9*3b-21*3b-2=0

Wy multiply elements

27b-63b-2=0

We add all the numbers together, and all the variables

-36b-2=0

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

-36b=2

b=2/-36

b=-1/18

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