\[ 11 - 1 = x - \frac{x}{6} \]
\[ 10 = \frac{6x - x}{6} \]
\[ 10 = \frac{5x}{6} \]
\[ x = 10 \cdot \frac{6}{5} \]
\[ x = \frac{60}{5} \]
\[ x = 12 \]
Ответ: 12