-(3-b)=-12-2b

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Solution for -(3-b)=-12-2b equation: 



-(3-b)=-12-2b

We move all terms to the left:

-(3-b)-(-12-2b)=0

We add all the numbers together, and all the variables

-(-1b+3)-(-2b-12)=0

We get rid of parentheses

1b+2b-3+12=0

We add all the numbers together, and all the variables

3b+9=0

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

3b=-9

b=-9/3

b=-3

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