9 + 7 =, 3 + 4 =, 11 - 7 =  , 15 - 10 = , 8 + 8 = , 6 - 4 =, 20 - 7 = , 6 + 12 = , 17 - 10 =, 9 + 9 = , 3 + 7 = , 16 - 5 = .

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