Frequent Questions about our Solver

The problem

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Wouldn't the answer just be x less than or equal to 9?

Answer provided by our tutors

Yes, the answer is "x less than or equal to 9".  The solution is showing the answer as "x<=9" and then restating the answer using an interval nomenclature, stating "x is an element of all numbers from negative infinity and up to and including 9".  The interval (] indicates a half-closed interval and -infinity is shown as an open interval because it is not a real number. 

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