Ответ:

Объяснение:

714. x + x/10 = -11/2 | ×20

20x +2x = -110

22x = -110

x = -110/22

x = -5

754. (x-6)² = (x+7)²

(x-6)² - (x+7)² = 0

(x-6-x-7)(x-6+x+7)=0

-13(2x + 1)=0

-26x - 13 = 0

-26x =13

x = 13/(-26)

x = -0.5