Any decision in an action referred to in Section 35520 to recommend reorganization or to recommend approval or disapproval of a petition for reorganization may be taken at, or following, a joint public hearing. If separate hearings are conducted in each county, a decision to grant or deny the proposed reorganization shall be made only after findings and tentative conclusions of the hearings in each county have been transmitted to the officer or agency which conducted the hearings in each of the other counties.