12 + 8 = ?, 18, 20, 22, 24, 25 − 9 = ?, 14, 15, 16, 17, 7 + 6 = ?, 12, 13, 14, 15, 30 − 12 = ?, 16, 18, 20, 22, 15 + 15 = ?, 25, 28, 30, 35, 40 − 17 = ?, 21, 22, 23, 24, 9 + 8 = ?, 15, 16, 17, 18, 50 − 25 = ?, 20, 25, 30, 35, 21 + 14 = ?, 33, 34, 35, 36, 60 − 30 = ?, 20, 25, 30, 35, 16 + 7 = ?, 21, 22, 23, 24, 45 − 18 = ?, 25, 26, 27, 28, 32 + 9 = ?, 39, 40, 41, 42, 70 − 24 = ?, 44, 46, 48, 50, 18 + 12 = ?, 28, 30, 32, 34, 83 − 40 = ?, 33, 43, 53, 63, 27 + 13 = ?, 30, 35, 40, 45, 55 − 19 = ?, 34, 36, 38, 40, 6 + 17 = ?, 21, 22, 23, 24, 100 − 45 = ?, 45, 50, 55, 65

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