\[3x + 12 > 2(4x - 3) - 5x\]
\[3x + 12 > 8x - 6 - 5x\]
\[3x - 3x > - 6 - 12\]
\[0x > - 18\]
\[при\ любом\ значении\ \text{x.}\]
\[Ответ:x \in ( - \infty; + \infty).\]