9b-7=6b+21

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Solution for 9b-7=6b+21 equation: 



9b-7=6b+21

We move all terms to the left:

9b-7-(6b+21)=0

We get rid of parentheses

9b-6b-21-7=0

We add all the numbers together, and all the variables

3b-28=0

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

3b=28

b=28/3

b=9+1/3

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