4 + 7
4 + 7 = 11
4 + 5
4 + 5 = 9
8 + 8
8 + 8 = 16
7 + 8
7 + 8 = 15
9+7
9 + 7 = 16
20 - 7
20 - 7 = 13
2 + 6
2 + 6 = 8
20 - 11
20 - 11 = 9
8 + 9
8 + 9 = 17
7 + 7
7 + 7 = 14
6 + 7
6 + 7 = 13
18 - 7
18 - 7 = 11
20 - 8
20 - 8 = 12
7 + 8
7 + 8 = 15
9 + 9
9 + 9 = 18
2 + 7
2 + 7 = 9
3 +6
3 + 6 = 9
14 - 5
14 - 5 = 9