Đáp án`+`Giải thích các bước giải:

Ta có:

`(2x - 1)^ 2 - 2 . (2x - 1) (x - 4) = 0`

`(2x - 1) . (2x - 1 - 2x + 8) = 0`

`(2x - 1) . [(2x - 2x) + (-1 + 8)] = 0`

`(2x - 1) . 7 = 0`

`2x - 1 = 0`

`x = 1/2`

Vậy `x = 1/2`

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