Ответ:

1) y=12

2)x=26

Пошаговое объяснение:

1) (76 - 5y)*3 + 56 = 104

(76 - 5y)*3 = 104 - 56

(76 - 5y)*3 = 48

76 - 5y = 48 / 3

76 - 5y = 16

-5y = 16 - 76

-5y = -60

y = 12

2) 20*(24 + x) = 1612 - 612

20*(24 + x) = 1000

24 + x = 1000 / 20

24 + x = 50

x = 50 – 24

x = 26