\(-\dfrac{5}{7}\left(\dfrac{2}{5}-x\right)=-\dfrac{7}{3}\\ \Rightarrow\dfrac{2}{5}-x=\left(-\dfrac{7}{3}\right):\left(-\dfrac{5}{7}\right)\\ \Rightarrow\dfrac{2}{5}-x=\left(-\dfrac{7}{3}\right).\left(-\dfrac{7}{5}\right)\\ \Rightarrow\dfrac{2}{5}-x=\dfrac{49}{15}\\ \Rightarrow x=\dfrac{2}{5}-\dfrac{49}{15}\\ \Rightarrow x=-\dfrac{43}{15}\)
`-5/7.(2/5-x)=-7/3`
`=>2/5-x=-7/3: (-5/7)`
`=>2/5-x=-7/3 xx (-7/5)`
`=>2/5-x=49/15`
`=>x= 2/5- 49/15`
`=>x=6/15- 49/15`
`=>x=-43/15`
-5/7.(2/5 - x) = -7/3
2/5 - x = -7/3 : (-5/7)
2/5 - x = 49/15
x = 2/5 - 49/15
x = -43/15
