Ответ:

Пошаговое объяснение:

1. 3/4 - х = 1/2 + 2/5

1. 15/20 - х = 10/20 + 8/20

1. 15/20 - х = 18/20

х = 1. 15/20 - 18/20

х = 35/20 - 18/20

х = 17/20

0,8 + (х - 3/4) = 37/40

8/10 + (х - 3/4) = 37/40

32/40 + (х - 30/40) = 37/40

х - 30/40 = 37/40 - 32/40

х - 30/40 = 5/40

х = 5/40 + 30/40

х = 35/40

х = 7/8