A) b(3b+1)-2(3b+1) = (b-2)(3b+1)

B) 6x-6y+ax-ay = 6(x-y) + a(x-y) = (6+a)(x-y)

Уравнение: (x-10)(x-1)-(x+1)(x-4) = 6

Раскрываем скобки и упрощаем:

x^2 - 11x + 10 - (x^2 - 4x + x - 4) = 6
x^2 - 11x + 10 - x^2 + 3x - 4 = 6
-8x + 6 = 6
-8x = 0
x = 0

Ответ: x = 0