What is the average temperature (in degrees Celsius) of a city over a week if the recorded temperatures are: 18°C, 22°C, 20°C, 21°C, 19°C, 23°C, and 17°C?
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What is the sum of the measures of an equilateral triangle's angles?
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Math question: "Factorize the expression 3x^2 + 9xy - 6x - 18y using the distributive property."