This morning the temperature was 12 degrees celsius.
By noon the temperature had increased by 7 degrees so now it is 19 degrees celsius
By 6 p.m. the temperature had dropped 5 degrees so now it is 14 degrees celsius
By 8 .p.m. the temperature had dropped 3 more degrees so now it is 11 degrees celsius.
12+7-5-3=11
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