Đáp án `+` Lời giải chi tiết:

`(3x + 1)(2x - 3) - 6x(x + 2) = 16`

`= (6x^2 - 9x + 2x - 3) - (6x^2 + 12x)`

`= 6x^2 - 7x - 3 - 6x^2 - 12x`

`= (6x^2 - 6x^2) + (-7x - 12x) - 3`

`= -19x - 3`

`-19x - 3 = 16`

`-19x = 16 + 3`

`-19x = 19`

`x = 19 / (-19)`

`x = -1`

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