`2/5x -1/3 = -2`
`=>2/5x=(-2)+1/3`
`=>2/5x=(-5)/3`
`=>x=(-5)/3:2/5`
`=>x=(-25)/6`
Vậy `x=-25/6`
`text{_______________________________}`
`|x-4/7| =1 1/7`
`=>|x-4/7|=8/7`
`=> x-4/7=8/7` hoặc `x-4/7=(-8)/7`
`=>x=8/7+4/7` hoặc `x=(-8)/7+4/7`
`=>x=12/7` hoặc `x=-4/7`
Vậy `x in {12/7;(-4)/7}`