\(=>x=\left(\dfrac{6}{7}-\dfrac{2}{5}\right):\dfrac{3}{5}=\left(\dfrac{30}{35}-\dfrac{14}{35}\right):\dfrac{3}{5}=\dfrac{16}{35}:\dfrac{3}{5}=\dfrac{16}{21}\)
\(\dfrac{3}{5}\times x=\dfrac{6}{7}-\dfrac{2}{5}\)
\(x=\left(\dfrac{6}{7}-\dfrac{2}{5}\right):\dfrac{3}{5}=\dfrac{16}{21}\)
\(\dfrac{3}{5}\times x=\dfrac{6}{7}-\dfrac{2}{5}=\dfrac{16}{35}\)
\(x=\dfrac{16}{35}:\dfrac{3}{5}=\dfrac{16}{21}\)