\[ -7x = 13 - 2 \cdot (8x - 7) \]
\[ -7x = 13 - 16x + 14 \]
\[ -7x = 27 - 16x \]
\[ -7x + 16x = 27 \]
\[ 9x = 27 \]
\[ x = \frac{27}{9} \]
\[ x = 3 \]
Ответ: 3