-9=-4+b

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Solution for -9=-4+b equation: 



-9=-4+b

We move all terms to the left:

-9-(-4+b)=0

We add all the numbers together, and all the variables

-(b-4)-9=0

We get rid of parentheses

-b+4-9=0

We add all the numbers together, and all the variables

-1b-5=0

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

-b=5

b=5/-1

b=-5

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