\[|3x + 4| = |2x + 9|\]
\[3x + 4 = 2x + 9\]
\[3x - 2x = 9 - 4\]
\[x = 5.\]
\[3x + 4 = - (2x + 9)\]
\[3x + 4 = - 2x - 9\]
\[3x + 2x = - 9 - 4\]
\[5x = - 13\]
\[x = - \frac{13}{5} = - 2\frac{3}{5} = - 2,6.\]
\[Ответ:5;\ - 2,6.\]