6-3(3-7b)=-87

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Solution for 6-3(3-7b)=-87 equation: 



6-3(3-7b)=-87

We move all terms to the left:

6-3(3-7b)-(-87)=0

We add all the numbers together, and all the variables

-3(-7b+3)+6-(-87)=0

We add all the numbers together, and all the variables

-3(-7b+3)+93=0

We multiply parentheses

21b-9+93=0

We add all the numbers together, and all the variables

21b+84=0

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

21b=-84

b=-84/21

b=-4

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