Find all real solutions. Answer in the exact form. Note that identities are not required to solve this exercise. 
Definitions:
Independent Variables
Elements within a model or an experiment that are intentionally modified to gauge their influence on variables that depend on them.
Units
Basic quantities or entities used to express measurements, counts, or in some contexts, the objects of study.
Regression Model
A mathematical model used to predict or explain the relationship between a dependent variable and one or more independent variables.
Unit Price
The cost or price of a single unit of a product, service, or measured quantity, allowing for direct cost comparison.
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