70 - 31 + 39 = ?, 90 - 45 + 45 = ?, 80 - 65 + 15 = ?, 99 - 22 + 77 = ?, 31 - 12 + 19 = ?, 71 - 23 + 48 = ?, 52 - 25 + 27 = ?, 42 - 14 + 28 = ?, 91 - 74 + 17 = ?, 73 - 58 + 15 = ?,

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