`(2x - 2,4)^2 : 3/4 - 1/3 = 1`
`(2x - 12/5)^2: 3/4 = 1 + 1/3`
`(2x - 12/5)^2: 3/4 = 4/3`
`(2x - 12/5)^2 = 4/3 . 3/4`
`(2x - 12/5)^2 = 1`
⇒`(2x - 12/5)^2 = (+-1)^2`
⇒`2x - 12/5 = 1` hoặc `2x - 12/5= -1`
`2x = 1 + 12/5` hoặc `2x = -1 + 12/5`
`2x = 17/5` hoặc `2x = 7/5`
`x = 17/5 : 2` hoặc `x = 7/5 : 2`
`x =17/10` hoặc `x = 7/10`
Vậy `x ∈ {17/10 ; 7/10}`
