20 - 9, 9 + 7, 4 ÷ 2, 4 x 3, 10 + 10, 18 - 5, 20 ÷ 5, 5 x 3, 8 - 2, 8 + 4, 7 x 2, 3 x 6, 13 - 6, 4 + 15

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