\(=\left(\dfrac{-3}{4}+\dfrac{2}{5}\right)\cdot\dfrac{7}{3}+\left(\dfrac{3}{5}+\dfrac{-1}{4}\right)\cdot\dfrac{7}{3}\)
\(=\dfrac{7}{3}\left(-\dfrac{3}{4}+\dfrac{2}{5}+\dfrac{3}{5}-\dfrac{1}{4}\right)\)
=0
\(=\dfrac{-7}{20}:\dfrac{3}{7}+\dfrac{7}{20}:\dfrac{3}{7}.\\ =0.\)
\(\left(-\dfrac{3}{4}+\dfrac{2}{5}\right):\dfrac{3}{7}+\left(\dfrac{3}{5}+\dfrac{-1}{4}\right):\dfrac{3}{7}\)
\(=\left(-\dfrac{3}{4}+\dfrac{2}{5}\right)\dfrac{7}{3}+\left(\dfrac{3}{5}+\dfrac{-1}{4}\right)\dfrac{7}{3}\)
\(=\dfrac{7}{3}\left(-\dfrac{3}{4}+\dfrac{2}{5}+\dfrac{3}{5}-\dfrac{1}{4}\right)\)
\(=\dfrac{7}{3}\left(1-1\right)\)
\(=\dfrac{7}{3}.0=0\)
`(-3/4 + 2/5) : 3/7 + (3/5 + (-1)/4) : 3/7`
`=> [ (-3/4 + 2/5) + (3/5 + (-1)/4 ) ] : 3/7`
`= [-3/4 + 2/5 + 3/5 + (-1)/4)]: 3/7`
`=[ -3/4 + 2/5 + 3/5 - 1/4] :3/7`
`=[ (-3/4 - 1/4) + (2/5+3/5) ] : 3/7`
`=[ (-1) +1] : 3/7`
`=0 : 3/7`
`=0`
