-15=12-3b

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Solution for -15=12-3b equation: 



-15=12-3b

We move all terms to the left:

-15-(12-3b)=0

We add all the numbers together, and all the variables

-(-3b+12)-15=0

We get rid of parentheses

3b-12-15=0

We add all the numbers together, and all the variables

3b-27=0

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

3b=27

b=27/3

b=9

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