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84.

Express the numbers in their prime factorisation in power form:

7 = 7

12 = 22 x 3

14 = 2 x 7

For LCM multiply together the highest power of the primes across all the numbers:

LCM = 22 x 3 x 7 = 84

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Q: What is the lowest common multiple of 7 12 14?
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