4 + 5 = 9 - 9 - 5 = 4, 6 * 3 = 18 - 18 / 6 = 3, 2 + 4 = 6 - 6 - 4 = 2, 3 * 5 = 15 - 15 / 5 = 3, 5 * 7 = 35 - 35 / 7 = 5, 8 - 5 = 3 - 3 + 5 = 8, 20 / 5 = 4 - 4 * 5 = 20, 16 / 4 = 4 - 4 * 4 = 16,

Match each operation with its undo operation

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