\(\dfrac{-11}{17}-\left(\dfrac{6}{17}-\dfrac{4}{5}\right)\)
\(=\dfrac{-11}{17}-\dfrac{6}{17}+\dfrac{4}{5}\)
\(=\left(-1\right)+\dfrac{4}{5}\)
\(=\dfrac{-1}{5}\)
\(\dfrac{-11}{17}-\left(\dfrac{6}{17}-\dfrac{4}{5}\right)=-\dfrac{11}{17}-\dfrac{6}{17}+\dfrac{4}{5}=-1+\dfrac{4}{5}=-\dfrac{1}{5}\)