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From 6am - 7am, the temperature rose 7 degrees F. From 7am-8am, the temperature rose 2 degrees F,
and from 8am-9am, the temperature rose 3 degrees F. If the temperature was 55 degrees at 9am,
what was the temperature at 6am?
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At 6 am, the temperature was 55 - 3 - 2 - 7 = 43 degrees F. ANSWER
Solved.
Everything is very simple and more than obvious.