Дано уравнение: 4 = 7 - 6(5x - 1).
\[ 4 = 7 - (6 \cdot 5x - 6 \cdot 1) \]
\[ 4 = 7 - (30x - 6) \]
\[ 4 = 7 - 30x + 6 \]
\[ 4 = 13 - 30x \]
\[ 4 - 13 = -30x \]
\[ -9 = -30x \]
\[ x = \frac{-9}{-30} \]
\[ x = \frac{9}{30} \]
\[ x = \frac{3}{10} \]
Ответ: 0.3