Tähe arvväärtuse leidmine (liitmine).
16 + a = 37
a + 55 = 87
a + 44 = 76
71 + a = 92
23 + 45 = a
42 + a = 65
68 + a = 93
34 + a = 91
68 + a = 97
15 + 75 = a
15 + a = 37
8 + a = 75
a + 22 = 89
a + 31 = 54
29 + a = 55
16 + a = 37
a + 55 = 87
a + 44 = 76
71 + a = 92
23 + 45 = a
42 + a = 65
68 + a = 93
34 + a = 91
68 + a = 97
15 + 75 = a
15 + a = 37
8 + a = 75
a + 22 = 89
a + 31 = 54
29 + a = 55