12b-3b=18

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Solution for 12b-3b=18 equation: 



12b-3b=18

We move all terms to the left:

12b-3b-(18)=0

We add all the numbers together, and all the variables

9b-18=0

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

9b=18

b=18/9

b=2

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