7 + 3 =  - 10, 9 + 4 = - 13, 12 + 8 = - 20, 17 + 7 = - 24, 23 + 7 =  - 30, 26 + 6 = - 32, 11 + 5 = - 16, 19 + 9 = - 28, 17 + 17 =  - 34, 9 + 9 = - 18,

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