16 + 3 = - 19, 7 + 8 = - 15, 20 + 25 = - 45, 11 + 15 = - 26, 13 + 12 = - 25, 42 + 10 = - 52, 75 + 5 = - 80 , 61 + 9 = - 70 , 22 + 7 =  - 29,

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