12b+3b=30

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Solution for 12b+3b=30 equation: 



12b+3b=30

We move all terms to the left:

12b+3b-(30)=0

We add all the numbers together, and all the variables

15b-30=0

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

15b=30

b=30/15

b=2

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