4 + 5 = 9 - 9 - 5 = 4 , 18 - 6 = 12 - 12 + 6 = 18, 8 + 2 = 10 - 10 - 2 = 8, 17 - 7 = 10 - 10 + 7 = 17, 1 + 4 = 5 - 5 - 4 = 1, 9 - 2 = 7 - 7 + 2 = 9, 10 + 10 = 20 - 20 - 10 = 10, 14 - 6 = 8 - 8 + 6 = 14, 6 + 7 = 13 - 13 - 7 = 6, 16 - 9 = 7 - 7 + 9 = 16, 8 + 11 = 19 - 19 - 11 = 8, 20 - 5 = 15 - 15 + 5 = 20,

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