Выполните действия: (19 5/21-8 3/14)-6 5/7.

\[\left( 19\frac{5^{\backslash 2}}{21} - 8\frac{3^{\backslash 3}}{14} \right) - 6\frac{5^{\backslash 6}}{7} =\]

\[= 19\frac{10}{42} - 8\frac{9}{42} - 6\frac{30}{42} =\]

\[= 18\frac{52}{42} - 14\frac{39}{42} = 4\frac{13}{42}\]