\(\dfrac{\dfrac{2}{7}-\dfrac{2}{9}+\dfrac{2}{37}}{\dfrac{5}{7}-\dfrac{5}{9}+\dfrac{5}{37}}-\dfrac{-\dfrac{1}{3}+\dfrac{1}{4}-\dfrac{1}{5}}{\dfrac{5}{6}-\dfrac{5}{8}+\dfrac{5}{10}}=\dfrac{2\left(\dfrac{1}{7}-\dfrac{1}{9}+\dfrac{1}{37}\right)}{5\left(\dfrac{1}{7}-\dfrac{1}{9}+\dfrac{1}{37}\right)}-\dfrac{-1\left(\dfrac{1}{3}-\dfrac{1}{4}+\dfrac{1}{5}\right)}{\dfrac{5}{2}\left(\dfrac{1}{3}-\dfrac{1}{4}+\dfrac{1}{5}\right)}\)
\(=\dfrac{2}{5}-\dfrac{-1}{\dfrac{5}{2}}=\dfrac{2}{5}+\dfrac{2}{5}=\dfrac{4}{5}\)