\[\frac{5x + 2}{12} + \frac{2x - 1}{15} = \frac{x + 4}{4}\ \ \ \ \ | \cdot 60\]
\[25x + 10 + 8x - 4 = 15x + 60\]
\[18x = 54\]
\[x = 3\]
\[Ответ:x = 3.\]