12-3b;b=3

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Solution for 12-3b;b=3 equation: 



12-3bb=3

We move all terms to the left:

12-3bb-(3)=0

We add all the numbers together, and all the variables

-3bb+9=0

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

-3bb=-9

b=-9/1

b=-9

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