\[ \frac{3(2x-1)}{15} - \frac{5(16-x)}{15} = 4 \]
\[ \frac{6x - 3 - (80 - 5x)}{15} = 4 \]
\[ \frac{6x - 3 - 80 + 5x}{15} = 4 \]
\[ \frac{11x - 83}{15} = 4 \]
\[ 11x - 83 = 4 \times 15 \]
\[ 11x - 83 = 60 \]
\[ 11x = 60 + 83 \]
\[ 11x = 143 \]
\[ x = \frac{143}{11} \]
\[ x = 13 \]
Ответ: 13