From noon on Monday to noon on Tuesday, the temperature dropped 3°F. From noon on Tuesday to
noon on Wednesday, the temperature rose 4.5°F. From noon on Wednesday to noon on Sunday, the
temperature rose 2°F, dropped 1.5°F, rose 1°F, then fell 1.2°F. If the temperature at noon on Sunday was
-2.2°F, what was the original temperature at noon on Monday?