=>2/3x=4/9+5/7=73/63
=>x=73/42
`2/3 x - 5/7=4/9`
`=> 2/3 x=4/9 + 5/7`
`=> 2/3 x=28/63 + 45/63`
`=> 2/3 x=73/63`
`=>x= 73/63:2/3`
`=>x= 73/63 xx 3/2`
`=>x= 219/126`
`=>x=73/42`
`#yLinh`
\(\dfrac{2}{3}x=\dfrac{4}{9}+\dfrac{5}{7}\\ =>\dfrac{2}{3}x=\dfrac{73}{63}=>x=\dfrac{73}{42}\)