126=-7(-3+3b)

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Solution for 126=-7(-3+3b) equation: 



126=-7(-3+3b)

We move all terms to the left:

126-(-7(-3+3b))=0

We add all the numbers together, and all the variables

-(-7(3b-3))+126=0



We calculate terms in parentheses: -(-7(3b-3)), so:

-7(3b-3)

We multiply parentheses

-21b+21

Back to the equation:

-(-21b+21)



We get rid of parentheses

21b-21+126=0

We add all the numbers together, and all the variables

21b+105=0

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

21b=-105

b=-105/21

b=-5

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