12=-4+5b-9b

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Solution for 12=-4+5b-9b equation: 



12=-4+5b-9b

We move all terms to the left:

12-(-4+5b-9b)=0

We add all the numbers together, and all the variables

-(-4b-4)+12=0

We get rid of parentheses

4b+4+12=0

We add all the numbers together, and all the variables

4b+16=0

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

4b=-16

b=-16/4

b=-4

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