-15=-3(b-1)

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Solution for -15=-3(b-1) equation: 



-15=-3(b-1)

We move all terms to the left:

-15-(-3(b-1))=0



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

-3(b-1)

We multiply parentheses

-3b+3

Back to the equation:

-(-3b+3)



We get rid of parentheses

3b-3-15=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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