ART. 1208. If from the law, or the nature or the wording of the obligations to which the preceding article refers the contrary does not appear, the credit or debt shall be presumed to be divided into as many equal shares as there are creditors or debtors, the credits or debts being considered distinct from one another, subject to the Rules of Court governing the multiplicity of suits. (1138a)

Furthermore, a joint divisible obligation is one where a concurrence of several creditors, or of several debtors, or of several creditors and debtors, by virtue of which, each of the creditors has a right to demand, and each of the debtors is bound to render compliance with his proportionate part of the prestation which constitute the object of the obligation. The prestation here is divisible e.g. money.
What happens in case of breach in joint divisible obligation?
In case of breach of obligation by one of the debtors, damages due must be borne alone by the debtor who caused breach.
[1] Rabuya. (2019). Obligations and Contracts.