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The instructions to find the LCM of 28, 35, 56 and 84 are the next:
1. Decompose all numbers into prime factors
28 2 14 2 7 7 1 35 5 7 7 1 56 2 28 2 14 2 7 7 1 84 2 42 2 21 3 7 7 1
2. Write all numbers as the product of its prime factors
Prime factors of 28 = 22 . 7
Prime factors of 35 = 5 . 7
Prime factors of 56 = 23 . 7
Prime factors of 84 = 22 . 3 . 7
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