\(=\dfrac{4}{5}\times\left(\dfrac{3}{7}+\dfrac{6}{7}-\dfrac{2}{7}\right)=\dfrac{4}{5}\times1=\dfrac{4}{5}\)
\(\dfrac{4}{5}\times\dfrac{3}{7}+\dfrac{4}{5}\times\dfrac{6}{7}+\dfrac{4}{5}\times\dfrac{2}{7}=\dfrac{4}{5}\times\left(\dfrac{3}{7}+\dfrac{6}{7}+\dfrac{2}{7}\right)=\dfrac{4}{5}\times1=\dfrac{4}{5}\)
= \(\dfrac{4}{5}\) x ( \(\dfrac{3}{7}\) + \(\dfrac{6}{7}\)- \(\dfrac{2}{7}\))
= \(\dfrac{4}{5}\) x 1
= \(\dfrac{4}{5}\)