7 - 4 = 3, 7 + 4 = 11, 7 - 4 = 1, , 5 + 7 + 3 = 15, 5 + 7 = 12, 7 + 3 = 10, , 10 + 8 = 15, 10 - 8 = 2, 10 + 8 = 18, , 7 - 4 = 3, 7 + 4 = 11, 7 - 3 = 4, , 3 + 3 = 6, 3 + 3 + 3 = 9, 6 - 3 = 3, , 3 - 1 = 2, 3 + 1 = 5, 3 + 1 = 4, , 2 + 3 = 5, 2 + 3 = 6, 5 + 3 = 8.

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