\(\left(6-2\dfrac{4}{5}\right):3\dfrac{1}{8}-1\dfrac{3}{5}:\dfrac{1}{4}=\left(6-\dfrac{14}{5}\right):\dfrac{25}{8}-\dfrac{8}{5}:\dfrac{1}{4}=\dfrac{16}{5}X\dfrac{8}{25}-\dfrac{8}{5}X\dfrac{4}{1}=\dfrac{128}{125}-\dfrac{32}{5}=\dfrac{-672}{125}\)
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