Вычислите 5/6-9/14.

\[\frac{5^{\backslash 7}}{6} - \frac{9^{\backslash 3}}{14} = \frac{5 \cdot 7 - 9 \cdot 3}{42} = \frac{35 - 27}{42} =\]

\[= \frac{8}{42} = \frac{4}{21}.\]