Simplify the expression. (Assume that r, s, and t are positive.) 
Definitions:
Highly Skilled Workers
Individuals with extensive training and expertise in particular fields, often requiring advanced education or specialized experience.
Household Income
The total amount of income earned by members of a household, including wages, salaries, benefits, and other income streams.
Total Income
The sum of all earnings or revenues received by an individual or organization, including wages, salaries, investment returns, and other sources.
Growing Income Inequality
The increasing gap in the distribution of income among individuals or households within a society.
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