n) (x+3)(x-4)-(x-7)(x-2)-2.

(x+3)(x-4) - (x-7)(x-2) = -2

x² - 4x + 3x - 12 - (x² - 2x - 7x + 14) = -2

x² - x - 12 - (x² - 9x + 14) = -2

x² - x - 12 - x² + 9x - 14 = -2

8x - 26 = -2

8x = 24

x = 3

Ответ: x = 3