$\\$
`e,`
`(-4)/7 - x = 3/5 - 2x`
`-> -x + 2x=3/5 +4/7`
`-> x=41/35`
Vậy `x=41/35`
$\\$
`f,`
`(3/8 - 1/5)+(5/8 - x)=1/5`
`->5/8 - x=1/5 - (3/8 -1/5)`
`->5/8 - x = 1/5 - 3/8 + 1/5`
`->5/8 - x = 2/5 - 3/8`
`->x=5/8 - 2/5 + 3/8`
`->x=1 - 2/5`
`->x=3/5`
Vậy `x=3/5`
