15=3b-9

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Solution for 15=3b-9 equation: 



15=3b-9

We move all terms to the left:

15-(3b-9)=0

We get rid of parentheses

-3b+9+15=0

We add all the numbers together, and all the variables

-3b+24=0

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

-3b=-24

b=-24/-3

b=+8

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