9=12-b

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Solution for 9=12-b equation: 



9=12-b

We move all terms to the left:

9-(12-b)=0

We add all the numbers together, and all the variables

-(-1b+12)+9=0

We get rid of parentheses

1b-12+9=0

We add all the numbers together, and all the variables

b-3=0

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

b=3

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