[tex]D = \frac{3}{8}+ \frac{5}{8}:( \frac{2}{3}+ \frac{1}{6})\\\\
D = \frac{3}{8}+ \frac{5}{8}:( \frac{2\times2}{3\times2}+ \frac{1}{6})\\\\
D=\frac{3}{8}+ \frac{5}{8}:( \frac{4}{6}+ \frac{1}{6})\\\\
D=\frac{3}{8}+ \frac{5}{8}: \frac{5}{6} \\\\
D=\frac{3}{8}+ \frac{5}{8}\times \frac{6}{5} \\\\
D=\frac{3}{8}+ \frac{5\times6}{8\times5} \\\\
D = \frac{3}{8}+ \frac{6}{8}\\\\
D = \frac{3+6}{8}\\\\
\boxed{D = \frac{9}{8} }
[/tex]