\(y=\left(\dfrac{6}{7}:\dfrac{2}{3}\right)-\dfrac{5}{9}=\dfrac{46}{73}\)
`(5/9+y)xx2/3=6/7`
`5/9+y=6/7:2/3`
`5/9+y=9/7`
`y=9/7-5/9`
`y=46/63`
Vậy..
`@An`
\(\dfrac{5}{9}\) + y =\(\dfrac{6}{7}\): \(\dfrac{2}{3}\) = \(\dfrac{6}{7}\) . \(\dfrac{3}{2}\) = \(\dfrac{9}{7}\)
y = \(\dfrac{9}{7}\) - \(\dfrac{5}{9}\) = \(\dfrac{46}{63}\)