-57=-3(3+4b)

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Solution for -57=-3(3+4b) equation: 



-57=-3(3+4b)

We move all terms to the left:

-57-(-3(3+4b))=0

We add all the numbers together, and all the variables

-(-3(4b+3))-57=0



We calculate terms in parentheses: -(-3(4b+3)), so:

-3(4b+3)

We multiply parentheses

-12b-9

Back to the equation:

-(-12b-9)



We get rid of parentheses

12b+9-57=0

We add all the numbers together, and all the variables

12b-48=0

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

12b=48

b=48/12

b=4

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