9+5 = 14
10 + ? = 14
? = 14-10
? = 4
14-7 = 7
14-4-? = 7
10-? = 7
10-7 = ?
? = 3
7+6 = 14
10+? = 14
? = 14-10
? = 4
18-9 = 9
18-8-? = 9
10-? = 9
10-9 = ?
? = 1
8+4 = 12
10+? = 12
? = 12-10
? = 2
15-7 = 8
15-5-? = 8
10-? = 8
10-8 = ?
? = 2
9+7 = 16
10+? = 16
? = 16-10
? = 6
17-9 = 8
17-7-? = 8
10-? = 8
10-8 = ?
? = 2