Verified answer

(x - 10)(x - 1) - (x + 1)(x - 4) = 6,

х² - х - 10х + 10 - (х² - 4х + х - 4) = 6,

х² - 11х + 10 - х² + 3х + 4 = 6,

-8х + 14 = 6,

-8х = 6 - 14,

-8х = -8,

х = -8 : (-8),

х = 1.

Ответ: 1.