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)clear all
All user variables and function definitions have been cleared. variables (2*x+1/x)$DMP([x], EXPR INT)

\label{eq1}\left[ \right](1)
Type: List(OrderedVariableList([x]))
variables (2*y+1/y)$DMP([y], INT)
There are 4 exposed and 7 unexposed library operations named variables having 1 argument(s) but none was determined to be applicable. Use HyperDoc Browse, or issue )display op variables to learn more about the available operations. Perhaps package-calling the operation or using coercions on the arguments will allow you to apply the operation.
Cannot find a definition or applicable library operation named variables with argument type(s) Fraction(Polynomial(Integer))
Perhaps you should use "@" to indicate the required return type, or "$" to specify which version of the function you need.

Possible Explanations: see SandBoxPolynomialQuizExplained

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