\[5\frac{9}{14} - 2\frac{3}{7} + 6,7 =\]
\[= 3\frac{9 - 6}{14} + 6\frac{7}{10} =\]
\[= 3\frac{3^{\backslash 5}}{14} + 6\frac{7^{\backslash 7}}{10} = 9\frac{15 + 49}{70} =\]
\[= 9\frac{64}{70} = 9\frac{32}{35}\]