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x/3 + x/5 + x/7 = 142
Sacamos el mcm de los denominadores
3 - 5 - 7 l 3
1 - 5 - 7 l 5
1 - 1 - 7 l 7
1 - 1 - 1
El mcm es : 3 * 5 * 7 = 105
35x + 21x + 15x
----------------------- = 142
105
35x + 21x + 15x = 105 (142)
71x = 14 910
x = 14910/71
x = 210
Respuesta.
x = 210