(\(\dfrac{5}{7}\)-\(\dfrac{7}{5}\))-[\(\dfrac{1}{2}\)-(\(\dfrac{-2}{7}\)-\(\dfrac{1}{10}\))]
=(\(\dfrac{25}{35}\)-\(\dfrac{49}{35}\))-[\(\dfrac{1}{2}\)-(\(\dfrac{-20}{70}\)-\(\dfrac{7}{70}\))
=\(\dfrac{-24}{35}\)-[\(\dfrac{1}{2}\)-(\(\dfrac{-27}{70}\))]
=\(\dfrac{-24}{35}\)-\(\dfrac{31}{35}\)
=\(\dfrac{-55}{35}\)
=\(\dfrac{-11}{7}\)