3b=39+12

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Solution for 3b=39+12 equation: 



3b=39+12

We move all terms to the left:

3b-(39+12)=0

We add all the numbers together, and all the variables

3b-51=0

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

3b=51

b=51/3

b=17

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