20 - 10 + 10 = ?, 35 - 20 + 15 = ?, 21 - 13 + 8 = ?, 5 - 13 - 8 = ?, 23 - 12 + 11 = ?, 6 - 11- 5 = ?, 30 - 15 + 15 = ?, 27 - 12 + 15 = ?, 3 - 15 - 12 = ?, 34 - 24 + 10 = ?, 15 - 24 - 9 = ?, 19 - 13 + 16 = ?, 10 - 22 - 12 = ?, 70 - 45 + 25 = ?, 14 - 18 - 4 = ?,

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