-9=5b+4b

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



-9=5b+4b

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(+9b)-9=0

We get rid of parentheses

-9b-9=0

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

-9b=9

b=9/-9

b=-1

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