\[ 2x - 5x + 5 = 7 - x \]
\[ -3x + 5 = 7 - x \]
\[ -3x + x = 7 - 5 \]
\[ -2x = 2 \]
\[ x = \frac{2}{-2} \]
\[ x = -1 \]
Ответ: -1