12+3b=42

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Solution for 12+3b=42 equation: 



12+3b=42

We move all terms to the left:

12+3b-(42)=0

We add all the numbers together, and all the variables

3b-30=0

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

3b=30

b=30/3

b=10

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