Answer:
-36
Step-by-step explanation:
When you have an equation like this, the best place to start is to multiply all of the terms by their greatest common denominator. In this case, the greatest common denominator would be 12.
[tex]12(\frac{b}{6}) - 12(\frac{b}{4}) = 12(3)\\2b - 3b = 36\\-1b = 36\\b = -36[/tex]
