3-9b=12

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Solution for 3-9b=12 equation: 



3-9b=12

We move all terms to the left:

3-9b-(12)=0

We add all the numbers together, and all the variables

-9b-9=0

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

-9b=9

b=9/-9

b=-1

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