Помогите пожалуйста решить, Безотлагательно! Заранее спасибо.

22.

x + x + x + x = 40

4x = 40

x = 10

54*x=54:x

54*x=54

x=1

x=-1

x=1

x+x+x=0

x=0

x - 19 = 0

x = 19

x + 40 = 40

x = 0

88 - 2x = 86

2x = 2

x = 1

23.

x = 90 : 30 = 3

x = 70 : 10 = 7

x = 70 - 10 = 60

x = 60 + 30 = 90

x = 8 + 9 = 17

x = 9*8 = 72

x = 42 - 42 = 0

x = 42 : 42 = 1

x = 54 - 54 = 0

x = 0 : 54 = 0

x = 76 : 2 = 38

x = 3 * 15 = 45