956 * 15 + 5316 -74 - 83 * 17 = 14340 + 5316 -74 - 1411 = 18171956 * 15 = 1434083 * 17 = 1411172 * 406 + 76960 : 8 - 38941 = 69832 + 9620 - 38941 = 40511172 * 406 = 6983276960 : 8 = 962075194 - 2759 + 45668 : 7 * 13 = 75194 - 2759 + 84812 = 15724745668 : 7 = 65246524 * 13 = 84812 800 000 - 645 * 402 : 90 * 170 = 800 000 - 489 770 = 310230645 * 402 = 259290259290 : 90 = 28812881 * 170 = 489770