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7 / 7 =1
Descomposición de 14:
14 / 2 = 7
7 / 7 = 1
14 = 2*7
Descomposición de 21:
21 / 3 = 7
7 / 7 = 1
21 = 3*7
mcm = 2*3*7
mcm = 42