\[\left( 23 - 15\frac{9}{14} \right) - \left( 12\frac{1^{\backslash 10}}{7} - 8\frac{2^{\backslash 14}}{5} \right) =\]
\[= 22\frac{70}{70} - 15\frac{45}{70} - 12\frac{10}{70} + 8\frac{28}{70} =\]
\[= 3\frac{70 - 45 - 10 + 28}{70} = 3\frac{43}{70}\]