9=b-12

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Solution for 9=b-12 equation: 



9=b-12

We move all terms to the left:

9-(b-12)=0

We get rid of parentheses

-b+12+9=0

We add all the numbers together, and all the variables

-1b+21=0

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

-b=-21

b=-21/-1

b=+21

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