956 * 15 + 5316 -74 - 83 * 17 = 14340 + 5316 -74 - 1411 = 18171
956 * 15 = 14340
83 * 17 = 1411
172 * 406 + 76960 : 8 - 38941 = 69832 + 9620 - 38941 = 40511
172 * 406 = 69832
76960 : 8 = 9620
75194 - 2759 + 45668 : 7 * 13 = 75194 - 2759 + 84812 = 157247
45668 : 7 = 6524
6524 * 13 = 84812
800 000 - 645 * 402 : 90 * 170 = 800 000 - 489 770 = 310230
645 * 402 = 259290
259290 : 90 = 2881
2881 * 170 = 489770