`a) x - 2/3 = 3/5 - 1/4`
`x - 2/3 = 7/20`
`x = 7/20 + 2/3`
`x = 61/60`
Vậy `x = 61/60`
`b) -2/3 x + 1/5 = 1/10`
`-2/3 x = 1/10 - 1/5`
`-2/3 x = -1/10`
`x = -1/10 : (-2/3)`
`x = 3/20`
Vậy `x = 3/20`
`c) 2 | 1/2 x - 1/3| - 3/2 = 1/4`
`2 | 1/2 x - 1/3| = 1/4 + 3/2`
`2 | 1/2 x - 1/3| = 7/4`
` | 1/2 x - 1/3| = 7/4 : 2`
` | 1/2 x - 1/3| = 7/8`
⇒ `1/2 x - 1/3 = 7/8` hoặc `1/2 x - 1/3 = -7/8`
`1/2 x = 7/8 + 1/3` hoặc `1/2 x = -7/8 + 1/3`
`1/2 x = 29/24` hoặc `1/2 x = -13/24`
`x = 29/24 : 1/2` hoặc `x = -13/24 : 1/2`
`x = 29/12` hoặc `x = -13/12`
Vậy `x ∈ {29/12 ; -13/12}`
`d) 4/5 - 1/2 x = 1/10`
`1/2 x = 4/5 - 1/10`
`1/2 x = 7/10`
`x = 7/10 : 1/2`
`x = 7/5`
Vậy `x = 7/5`
