9b+15=12b-6

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Solution for 9b+15=12b-6 equation: 



9b+15=12b-6

We move all terms to the left:

9b+15-(12b-6)=0

We get rid of parentheses

9b-12b+6+15=0

We add all the numbers together, and all the variables

-3b+21=0

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

-3b=-21

b=-21/-3

b=+7

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