If two or more partners have been intrusted with the management of the partnership without specification of their respective duties, or without a stipulation that one of them shall not act without the consent of all the others, each one may separately execute all acts of administration, but if any of them should oppose the acts of the others, the decision of the majority shall prevail. In case of a tie, the matter shall be decided by the partners owning the controlling interest. (1693a)