15 − 7 =, 8, 9, 20 − 9 =, 10, 11, 25 − 12 =, 14, 13, 18 − 6 =, 12, 13, 30 − 15, 15, 16, 14 − 8 =, 5, 6, 22 − 13 =, 9, 8, 17 − 5 =, 11, 12, 987,654 − 468,795 =, 518,859, 519,859, 50 − 27 =, 24, 23

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