-3b-12=-7b

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Solution for -3b-12=-7b equation: 



-3b-12=-7b

We move all terms to the left:

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

We get rid of parentheses

-3b+7b-12=0

We add all the numbers together, and all the variables

4b-12=0

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

4b=12

b=12/4

b=3

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