7 - 7 = - 0, 8 - 7 = - 1, 9 - 7 = - 2, 10 - 7 = - 3, 11 - 7 = - 4, 12 - 7 = - 5, 13 - 7 = - 6, 14 - 7 = - 7, 15 - 7 =  - 8, 16 - 7 = - 9, 17 - 7 = - 10, 18 - 7 = - 11, 19 - 7 = - 12 ,

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