-3(-8+b)=-21

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Solution for -3(-8+b)=-21 equation: 



-3(-8+b)=-21

We move all terms to the left:

-3(-8+b)-(-21)=0

We add all the numbers together, and all the variables

-3(b-8)-(-21)=0

We add all the numbers together, and all the variables

-3(b-8)+21=0

We multiply parentheses

-3b+24+21=0

We add all the numbers together, and all the variables

-3b+45=0

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

-3b=-45

b=-45/-3

b=+15

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