-3(b-3)=-21

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Solution for -3(b-3)=-21 equation: 



-3(b-3)=-21

We move all terms to the left:

-3(b-3)-(-21)=0

We add all the numbers together, and all the variables

-3(b-3)+21=0

We multiply parentheses

-3b+9+21=0

We add all the numbers together, and all the variables

-3b+30=0

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

-3b=-30

b=-30/-3

b=+10

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