b. \(\left(\dfrac{3}{8}+-\dfrac{3}{4}+\dfrac{7}{12}\right):\dfrac{5}{6}+\dfrac{1}{2}\\ =\left(\dfrac{9}{24}-\dfrac{18}{24}+\dfrac{14}{24}\right):\dfrac{5}{6}+\dfrac{1}{2}\\ =\dfrac{5}{24}:\dfrac{5}{6}+\dfrac{1}{2}\\ =\dfrac{1}{4}+\dfrac{1}{2}\\ =\dfrac{3}{4}\)