Upon the filing of the petition as provided in Section 7-3-1, the court shall set the same for public hearing which date of public hearing shall be within 30 days of the date of the filing of the petition. The court shall give at least 10 days notice of such hearing by publishing notice thereof once in a newspaper published in the municipality from which the territory is sought to be detached, or if there is no such newspaper published in such municipality, then such notice shall be published once in a newspaper having a general circulation within such municipality, the date of such publication to be not less than 10 days prior to the date set for the public hearing. The notice (1) shall refer to the petition filed with the court, (2) shall describe the territory proposed to be disconnected, (3) shall indicate the prayer of the petition and the date, time and place at which the public hearing will be held and (4) shall further indicate that the municipality and any persons residing in or owning property in the territory involved or in the municipality from which such territory is sought to be disconnected shall have an opportunity to be heard on the prayer of the petition. Notice of the filing of the petition, the substance of which shall be as hereinabove prescribed for the published notice shall also be mailed to the presiding officer of the municipality from which the territory is sought to be disconnected.