`1 2/5x +3/7=(-4)/5`
`7/5x + 3/7 = (-4)/5`
`7/5x = (-4)/5 - 3/7`
`7/5x = (-43)/35`
`x= (-43)/49`
\(1\dfrac{2}{5}x+\dfrac{3}{7}=\dfrac{-4}{5}\)
\(\dfrac{7}{5}x+\dfrac{3}{7}=\dfrac{-4}{5}\)
\(\dfrac{7}{5}x=\dfrac{-4}{5}-\dfrac{3}{7}\)
\(x=\dfrac{-43}{35}\)