Perform the indicated operation. Reduce your answer to lowest terms. 
Definitions:
Theoretical Models
Conceptual frameworks used to understand, explain, and make predictions about a particular domain of interest.
Freud's Theory
A set of psychoanalytic theories developed by Sigmund Freud, emphasizing unconscious motivations and conflicts as determinants of human behavior.
Developmental Stages
The stages children go through as the libido moves through the body.
Libido
Sigmund Freud’s term for sexual psychic energy.
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