\[8\frac{6^{\backslash 2}}{35} - 6\frac{7^{\backslash 7}}{10} = 8\frac{12}{70} - 6\frac{49}{70} =\]
\[= 7\frac{82}{70} - 6\frac{49}{70} = 1\frac{33}{70}\]