Nora spends a winter day recording the temperature once every three hours for science class. At 9 am, the temperature was -12.4 °F. Between 9am and noon, the temperature increased by 7.6 °F. Between noon and 3pm, the temperature went up 13.1 °F. Between 3pm and 6 pm the temperature dropped 1.2 °F. What was the temperature at 6pm?
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