-3b-12=-4b-5b

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Solution for -3b-12=-4b-5b equation: 



-3b-12=-4b-5b

We move all terms to the left:

-3b-12-(-4b-5b)=0

We add all the numbers together, and all the variables

-3b-(-9b)-12=0

We get rid of parentheses

-3b+9b-12=0

We add all the numbers together, and all the variables

6b-12=0

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

6b=12

b=12/6

b=2

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