Решите уравнение: 12x^2-(3x-4)(4x+1)=19.

\[12x² - (3x - 4)(4x + 1) = 19\]

\[13x = 15\]

\[x = \frac{15}{13} = 1\frac{2}{13}\]

\[Ответ:x = 1\frac{2}{13}.\]