3b+9b=12

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Solution for 3b+9b=12 equation: 



3b+9b=12

We move all terms to the left:

3b+9b-(12)=0

We add all the numbers together, and all the variables

12b-12=0

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

12b=12

b=12/12

b=1

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