-12-4(5b+21)=4b

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Solution for -12-4(5b+21)=4b equation: 



-12-4(5b+21)=4b

We move all terms to the left:

-12-4(5b+21)-(4b)=0

We add all the numbers together, and all the variables

-4b-4(5b+21)-12=0

We multiply parentheses

-4b-20b-84-12=0

We add all the numbers together, and all the variables

-24b-96=0

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

-24b=96

b=96/-24

b=-4

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