956 * 15 + 5316 - 74 - 83 * 17 = 18171
1) 956*15=14340
2) 83*17=1411
3) 14340+5316=19656
4) 19656 - 74 = 19582
5) 19582 - 1411= 18171
172 * 406 + 76960 / 8 - 38941 = 40511
1) 172 * 406 = 69832
2)76960 / 8 = 9620
3) 69832 + 9620 = 79452
4) 79452 - 38941 = 40511
75194 - 2759 + 45668 / 7 * 13 = 157247
1) 45668 / 7 = 6524
2) 6524 * 13 = 84812
3) 75194 - 2759 = 72435
4) 72435 + 84812 = 157247
800000 - 645 * 402 / 90 * 170 = 310230
1) 645 * 402 = 259290
2) 259290 / 90 = 2881
3) 2881 * 170 = 489770
4) 800000 - 489770 = 310230
