14 – 7 = - 14 – 7 =7, 9 + 3 = - 9 + 3 =12, 15 – 8 = - 15 – 8 =7, 7 + 4 = - 7 + 4 =11, 16 – 9 = - 16 – 9 =7, 8 + 4 = - 8 + 4 =12, 14 – 8 = - 14 – 8 =6, 7 + 8 = - 7 + 8 =15, 15 – 9 = - 15 – 9 =6, 6 + 5 = - 6 + 5 =11, 9 + 9 = - 9 + 9 =18, 14 – 6 = - 14 – 6 =8, 6 + 7 = - 6 + 7 =13, 15 – 7 = - 15 – 7 =8, 8 + 6 = - 8 + 6 =14,

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