-3(-4b+7)=-105

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Solution for -3(-4b+7)=-105 equation: 



-3(-4b+7)=-105

We move all terms to the left:

-3(-4b+7)-(-105)=0

We add all the numbers together, and all the variables

-3(-4b+7)+105=0

We multiply parentheses

12b-21+105=0

We add all the numbers together, and all the variables

12b+84=0

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

12b=-84

b=-84/12

b=-7

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