3(-3+2b)=-21

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Solution for 3(-3+2b)=-21 equation: 



3(-3+2b)=-21

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

3(2b-3)+21=0

We multiply parentheses

6b-9+21=0

We add all the numbers together, and all the variables

6b+12=0

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

6b=-12

b=-12/6

b=-2

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