If there is a recognized school district which as a result of detachment is without a school building, the detachment may be set aside by the regional board of school trustees of the region in which the regional superintendent of schools had supervision and control, as defined in Section 3-14.2 of this Code, prior to the detachment upon petition by two-thirds of the eligible voters in the school district after such detachment and the detached area. The regional board of school trustees shall conduct a hearing upon the petition as prescribed and in the manner provided in Section 7-6 of this Code.