The only way to repeal an amendment to the U. S. Constitution is with another duly ratified amendment.
On behalf of
"Duly formed" typically refers to something that has been properly organized or established in accordance with the required procedures or laws. This term is often used in contexts such as companies, organizations, or agreements to indicate that they have been legally created or ratified.
If a law if proposed it then has to be voted on. When the law is passed it is ratified.
approved
"Duly constituted" typically refers to something that has been properly established or arranged according to the appropriate laws or regulations. For example, a "duly constituted committee" would be one that has been officially formed and approved according to the organization's rules.
Duly is an adverb.
your information is duly noted
it means approved
You need a license which is duly authorised. Duly meaning as appropriate or in the correct way or fashion.
Your point is duly noted.
Your changes for the project are duly noted.