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34 - 7 - 9 = 34 - 16 = 18

3(7 - 4) + 9 = 9 + 9 = 18

(7 - 4) x (9 - 3) = 3 x 6 = 18

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9y ago
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Q: How do you make 18 by 3 4 7 and 9 only using it once?
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