Verified answer

Пошаговое объяснение:

1)

(х + 9 7/8) - 4 1/2 = 7 3/4

х + 9 7/8 = 7 3/4 + 4 1/2

х + 9 7/8 = 7 6/8 + 4 4/8

х + 9 7/8 = 11 10/8

х = 11 10/8 - 9 7/8

х = 2 3/8

2)

5 8/25 + (9 7/10 - х) = 7 1/20

9 7/10 - х = 7 1/20 - 5 8/25

9 70/100 - х = 7 5/100 - 5 32/100

9 70/100 - х = 6 105/100 - 5 32/100

9 70/100 - х = 1 73/100

х = 9 70/100 - 1 73/100

х = 8 170/100 - 1 73/100

х = 7 97/100