Для каждого значения a:
a = 20a - 18 = 20 - 18 = 2a + 24 = 20 + 24 = 44
a = 38a - 18 = 38 - 18 = 20a + 24 = 38 + 24 = 62
a = 42a - 18 = 42 - 18 = 24a + 24 = 42 + 24 = 66
a = 56a - 18 = 56 - 18 = 38a + 24 = 56 + 24 = 80
Для каждого значения a:
a = 20
a - 18 = 20 - 18 = 2
a + 24 = 20 + 24 = 44
a = 38
a - 18 = 38 - 18 = 20
a + 24 = 38 + 24 = 62
a = 42
a - 18 = 42 - 18 = 24
a + 24 = 42 + 24 = 66
a = 56
a - 18 = 56 - 18 = 38
a + 24 = 56 + 24 = 80