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el común múltiplo de:
6, 12, 7 y 2 es 84 pues:
6*14 = 84
12*7 = 84
2*42 = 84
entonces:
84x/84 = (14x/84) + (7x/84) + (12x/84) + 5 + (42x/84) + 4
(84x/84) - {(14x/84) + (7x/84) + (12x/84) + (42x/84)} = 5 + 4
(84x/84) - {75x/84} = 9
9x/84 = 9
x = 9*84/9
x = 84
Comprobación:
84 = (84/6) + (84/12) + (84/7) + 5 + (84/2) + 4
84 = 14 + 7 + 12 + 5 + 42 + 4
Respuesta:
x = 84