$\color{#1c1c1c}{\text{T}}$$\color{#363636}{\text{h}}$$\color{#4f4f4f}{\text{u}}$$\color{#696969}{\text{w}}$$\color{#828282}{\text{2}}$$\color{#9c9c9c}{\text{t}}$$\color{#b5b5b5}{\text{u}}$$\color{#cfcfcf}{\text{o}}$$\color{#eee9e9}{\text{i}}$

`_` `_` `_` `_` `_`

`(2x -` `1) (``3x +` `1) =` `(3x + 2)^2 - 3x^2`

`=>` `6x^2 + 2x` `- 3x -` `1 = 9x^2` `+ 12x +` `4 - 3x^2`

`=>`` 6x^2 + 2x` `- 3x -` `9x^2 - 12x` `+ 3x^2 =` `4 + 1`

`=>` `-13x = 5`

`=>` `x =` `5 : (-13)`

`=>` `x = -5/13`

Vậy nghiệm của phương trình là `x = -5/13`