99 + 1 = - 100, 5 + 5 = - 10, 2 + 6 = - 8, 6 - 1 = - 5, 7 + 8 = - 15, 16 - 5 = - 11, 5 + 7 = - 12, 9 - 9 = - 0, 23 - 10 = - 13, 5 + 1 = - 6,

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