Prior to final adoption, amendment or repeal by the commission of any rule, the commission shall hold a public hearing thereon for the purpose of gaining public acceptance of the adoption, amendment or repeal of the rule. The commission shall publish one notice in a newspaper of general circulation in the county at least twenty days prior to the hearing specifying the time and place the hearing will be held, together with the text of the proposed rule or amendment or repeal of a rule. Every rule or amendment or repeal of a rule shall state the date on which it takes effect.