-3b-9=-4b

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Solution for -3b-9=-4b equation: 



-3b-9=-4b

We move all terms to the left:

-3b-9-(-4b)=0

We get rid of parentheses

-3b+4b-9=0

We add all the numbers together, and all the variables

b-9=0

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

b=9

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