7 * 3 + 9 = 21 + 9 = 30
4 + 7 - 14 = 11 - 14 = -3
9 : 3 + 4 = 3 + 4 = 7
14 : 2 * 7 = 7 * 7 = 49
49 - 8 * 5 = 49 - 40 = 9
30 - (19 + 7) = 30 - 26 = 4
72 : 9 = 8
8 * 8 = 64
60 + 5 = 65
81 : 9 = 9
10 = 10