-12=3+3b

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Solution for -12=3+3b equation: 



-12=3+3b

We move all terms to the left:

-12-(3+3b)=0

We add all the numbers together, and all the variables

-(3b+3)-12=0

We get rid of parentheses

-3b-3-12=0

We add all the numbers together, and all the variables

-3b-15=0

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

-3b=15

b=15/-3

b=-5

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