\[\boxed{\text{5.\ 16}}\]
\[\textbf{а)}\ x = 6:\]
\[- \frac{1}{2} \cdot 6 = - 3\]
\[\frac{1}{2} \cdot 6 = 3\]
\[- 2 \cdot 6 = - 12\]
\[- \frac{1}{3} \cdot 6 = - 2\]
\[- 3 \cdot 6 = - 18\]
\[- 1\frac{1}{2} \cdot 6 = - \frac{3}{2} \cdot 6 = - 9\]
\[0 \cdot 6 = 0\]
\[- 1 \cdot 6 = - 6\]
\[\frac{2}{3} \cdot 6 = 4\]
\[1 \cdot 6 = 6\]
\[\textbf{б)}\ x = 3:\]
\[6\ :3 = 2\]
\[- \frac{2}{3}\ :3 = - \frac{2}{3} \cdot \frac{1}{3} = - \frac{2}{9}\]
\[- 1\ :3 = - \frac{1}{3}\]
\[\frac{1}{3}\ :3 = \frac{1}{3} \cdot \frac{1}{3} = \frac{1}{9}\]
\[\frac{1}{6}\ :3 = \frac{1}{6} \cdot \frac{1}{3} = \frac{1}{18}\]
\[- 6\ :3 = - 2\]
\[- \frac{1}{2}\ :3 = - \frac{1}{2} \cdot \frac{1}{3} = - \frac{1}{6}\]
\[2\ :3 = \frac{2}{3}\]
\[\frac{1}{2}\ :3 = \frac{1}{2} \cdot \frac{1}{3} = \frac{1}{6}\]
\[- 3\ :3 = - 1\]