Find the values of x for which the function is continuous. 
Definitions:
External Jugular Vein
A vein located superficially on the side of the neck, which drains blood from the face, neck, and scalp.
Superficial Vein
A vein that is situated close to the surface of the body, generally visible under the skin and not associated with deeper tissues or arteries.
Necrotic Tissue
Dead tissue that results from the lack of blood supply, often associated with infection, injury, or diseases.
Ischemia
A condition resulting from inadequate blood supply to an organ or part of the body, often leading to tissue damage.
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