3(b-1)=-15

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



3(b-1)=-15

We move all terms to the left:

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

We add all the numbers together, and all the variables

3(b-1)+15=0

We multiply parentheses

3b-3+15=0

We add all the numbers together, and all the variables

3b+12=0

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

3b=-12

b=-12/3

b=-4

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