`a) 3/2 . x - 1/4 = -2`
`⇒ 3/2 . x = -2 + 1/4`
`⇒ 3/2 . x = (-8)/4 + 1/4`
`⇒ 3/2 . x = (-7)/4`
`⇒ x = (-7)/4 : 3/2`
`⇒ x = (-7)/4 . 2/3`
`⇒ x = (-7)/6`
Vậy `x = (-7)/6`
`b) 4/5 - 1/2 . x = (-1)/2`
`⇒ 1/2 . x = 4/5 - (-1)/2`
`⇒ 1/2 . x = 4/5 + 1/2`
`⇒ 1/2 . x = 8/10 + 5/10`
`⇒ 1/2 . x = 13/10`
`⇒ x = 13/10 : 1/2`
`⇒ x = 13/10 . 2`
`⇒ x = 13/5`
Vậy `x = 13/5`
`c) -1 1/4 - 3/4 . x = - (-1)/2`
`⇒ (-5)/4 - 3/4 . x = 1/2`
`⇒ 3/4 . x = (-5)/4 - 1/2`
`⇒ 3/4 . x = (-5)/4 - 2/4`
`⇒ 3/4 . x = (-7)/4`
`⇒ x = (-7)/4 : 3/4`
`⇒ x = (-7)/4 . 4/3`
`⇒ x = (-7)/3`
Vậy `x = (-7)/3`
