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+6=0

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

-b=-6

b=-6/-1

b=+6

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