`|x - 2/3| + 3/5 = 1 3/5`
`=> |x - 2/3| + 3/5 = 8/5`
`=> |x - 2/3| = 8/5 - 3/5`
`=> |x - 2/3| = 1`
`=> x - 2/3 = 1`hoặc`-1`
`TH1 : x - 2/3 = 1 => x = 1 + 2/3 = 1 2/3 = 5/3.`
`TH2 : x - 2/3 = -1 => x = -1 + 2/3 = -3/3 + 2/3 = -1/3.`
`(2/3 x + 1/3)^2 = 4/9`
`=> (2/3 x + 1/3)^2 - (2/3)^2`
`=> 2/3 x + 1/3 = 2/3`
`=> 2/3 x = 2/3 - 1/3`
`=> 2/3 x = 1/3`
`=> x = 1/3 : 2/3`
`=> x = 1/3 . 3/2`
`=> x = 1/2.`