On a certain day, the temperature in Qiqihar was 5°C at 12:00 noon, and dropped by 6°C at 8:00 pm, so what is the temperature at 8:00 pm that day?
某日，齐齐哈尔的气温中午12点为5℃，到晚上8点下降了6℃，那么这天晚上8点的气温为多少．
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