\[ 3(5x+8) - 7x = 6x \]
\[ 15x + 24 - 7x = 6x \]
\[ (15x - 7x) + 24 = 6x \]
\[ 8x + 24 = 6x \]
\[ 24 = 6x - 8x \]
\[ 24 = -2x \]
\[ x = \frac{24}{-2} \]
\[ x = -12 \]
Проверка:
Подставим x = -12 в исходное уравнение:
\[ 3(5(-12)+8) - 7(-12) = 6(-12) \]
\[ 3(-60+8) + 84 = -72 \]
\[ 3(-52) + 84 = -72 \]
\[ -156 + 84 = -72 \]
\[ -72 = -72 \]
Ответ: -12