6b+9=9b-12

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



6b+9=9b-12

We move all terms to the left:

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

We get rid of parentheses

6b-9b+12+9=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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