Ответ:

х = 10 1/3

Пошаговое объяснение:

1/2(1/2+4)=1/4x-1/3

1/2 * 4 1/2 = 1/4х - 1/3

1/2 * 9/2 + 1/3 = 1/4х

9/4 + 1/3 = 1/4х

31/12 = 1/4х

х = 31/12 : 1/4

х = 31/12 * 4

х = 31/3 = 10 1/3