27 + 11 = - 38, 20 + 57 = - 77, 87 − 50 = - 37, 63 + 27 = - 90, 78 + 3 = - 81, 35 + 17 = - 52, 41 − 18 = - 23, 16 + 35 = - 51, 19 + 68 = - 87, 36 − 18 = - 18, 38 − 18 = - 20, 77 + 10 = - 87, 37 + 26 = - 63, 90 − 12 = - 78, 81 − 46 = - 35, 52 − 11 = - 41, 23 − 7 = - 16, 51 − 32 = - 19, 87 − 51 = - 36, 18 + 9 = - 27,

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