15+3b=42

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Solution for 15+3b=42 equation: 



15+3b=42

We move all terms to the left:

15+3b-(42)=0

We add all the numbers together, and all the variables

3b-27=0

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

3b=27

b=27/3

b=9

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