9b-12=9b+21

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Solution for 9b-12=9b+21 equation: 



9b-12=9b+21

We move all terms to the left:

9b-12-(9b+21)=0

We get rid of parentheses

9b-9b-21-12=0

We add all the numbers together, and all the variables

-33!=0

There is no solution for this equation

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