12-3b=-(-3b-7)=6b

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Solution for 12-3b=-(-3b-7)=6b equation: 



12-3b=-(-3b-7)=6b

We move all terms to the left:

12-3b-(-(-3b-7))=0



We calculate terms in parentheses: -(-(-3b-7)), so:

-(-3b-7)

We get rid of parentheses

3b+7

Back to the equation:

-(3b+7)



We get rid of parentheses

-3b-3b-7+12=0

We add all the numbers together, and all the variables

-6b+5=0

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

-6b=-5

b=-5/-6

b=5/6

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