\[\frac{2x + 3}{3} - \frac{x + 1}{4} < - 1\ \ | \cdot 12\]
\[4(2x + 3) - 3(x + 1) < - 12\]
\[8x + 12 - 3x - 3 < - 12\]
\[5x < - 12 - 9\]
\[5x < - 21\]
\[x < - 4,2.\]
\[Ответ:x = ( - \infty; - 4,2).\]