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9 * 7 * 2 + 5 * 3 * 9 - 2 * 4 * 9 = El factor comun es el 9
9 * ( 7 * 2 + 5 * 3 - 2 * 4) =
9 * ( 14 + 15 - 8) =
9 * ( 29 - 8) =
9 * (21) =
189
Respuesta.
El factor comun es el 9