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Two thirds is described as already simplified because 2 and 3 have no common:
ACommon factors
BCommon digits
CCommon signs
DAny decimals
Answer & Solution
Correct answer: A. Common factors
1. The numerical case illustrates the algebraic rule.
2. A rational expression is simplified if there are no common factors.
3. Two thirds is simplified because there are no common factors of 2 and 3.
4. The same test applies to expressions with variables.
_Source: OpenStax Elementary Algebra 2e (CC BY 4.0), Ch 8 'Rational Expressions and Equations', sections 8.1-8.9_
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