-57=3(b+-13)

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Solution for -57=3(b+-13) equation: 



-57=3(b+-13)

We move all terms to the left:

-57-(3(b+-13))=0

We add all the numbers together, and all the variables

-(3(b-13))-57=0



We calculate terms in parentheses: -(3(b-13)), so:

3(b-13)

We multiply parentheses

3b-39

Back to the equation:

-(3b-39)



We get rid of parentheses

-3b+39-57=0

We add all the numbers together, and all the variables

-3b-18=0

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

-3b=18

b=18/-3

b=-6

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