-15=9+b

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Solution for -15=9+b equation: 



-15=9+b

We move all terms to the left:

-15-(9+b)=0

We add all the numbers together, and all the variables

-(b+9)-15=0

We get rid of parentheses

-b-9-15=0

We add all the numbers together, and all the variables

-1b-24=0

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

-b=24

b=24/-1

b=-24

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