-3(7+6b)+3b=-21-6b

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Solution for -3(7+6b)+3b=-21-6b equation: 



-3(7+6b)+3b=-21-6b

We move all terms to the left:

-3(7+6b)+3b-(-21-6b)=0

We add all the numbers together, and all the variables

-3(6b+7)+3b-(-6b-21)=0

We add all the numbers together, and all the variables

3b-3(6b+7)-(-6b-21)=0

We multiply parentheses

3b-18b-(-6b-21)-21=0

We get rid of parentheses

3b-18b+6b+21-21=0

We add all the numbers together, and all the variables

-9b=0

b=0/-9

b=0

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