31 * 4 - 52 = 124 - 52 = 72
4 * 18 + 45 = 72 + 45 = 117
65 : 5 + 40 = 13 + 40 = 53
50 * 5 - 70 = 250 - 70 = 180
76 : 4 + 15 = 19 + 15 = 34
26 * 3 - 18 = 78 - 18 = 60