3(-7-8b)=-213

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Solution for 3(-7-8b)=-213 equation: 



3(-7-8b)=-213

We move all terms to the left:

3(-7-8b)-(-213)=0

We add all the numbers together, and all the variables

3(-8b-7)-(-213)=0

We add all the numbers together, and all the variables

3(-8b-7)+213=0

We multiply parentheses

-24b-21+213=0

We add all the numbers together, and all the variables

-24b+192=0

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

-24b=-192

b=-192/-24

b=+8

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