Simplify the expression. 
Definitions:
Observations
The act of recording or the data recorded during an experiment or study, representing instances or examples of a phenomenon.
Dependent Variable
A variable whose value depends on one or more other variables, often examined in statistical models to understand the effect of independent variables.
Years of Education
A demographic measure referring to the total number of years that an individual has received formal education.
Income
The financial gain received by an individual or entity, typically measured over a certain period of time, from work or investments.
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