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Omni-MATH / Emilia writes down the numbers 5,x, and 9. Valentin calculates the mean (average) of each pair of these numbers and obtains 7, 10, and 12. What is the value of x? · Discussion

Discussing Emilia writes down the numbers 5,x, and 9. Valentin calculates the mean (average) of each pair of these numbers and obtains 7, 10, and 12. What is the value of x? · Omni-MATH

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