This morning the temperature was 12 degrees Celsius .
By 12pm it had increased by 7degrees so it is now 19 degrees Celsius.
By 6pm the temperature then dropped by 5 dgrees to be 14 degrees Celsius.
Now at 8pm, it has dropped 3 more degrees, so the new temperature is 11 degrees Celsius.
12+7-5-3=11
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