2 + 2 = - 4, 6 + 6 = - 12, 2 + 4 = - 6, 6 - 1 = - 5, 7 + 10 = - 17, 18 - 10 = - 8, 7 + 2 = - 9, 6 + 4 = - 10, 10 + 10 = - 20, 4 - 1 = - 3,

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