-133=-7(1+3b)

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Solution for -133=-7(1+3b) equation: 



-133=-7(1+3b)

We move all terms to the left:

-133-(-7(1+3b))=0

We add all the numbers together, and all the variables

-(-7(3b+1))-133=0



We calculate terms in parentheses: -(-7(3b+1)), so:

-7(3b+1)

We multiply parentheses

-21b-7

Back to the equation:

-(-21b-7)



We get rid of parentheses

21b+7-133=0

We add all the numbers together, and all the variables

21b-126=0

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

21b=126

b=126/21

b=6

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