Kirk, who lives in Germany, is reading a letter from his pen pal in the United States. His pen pal says that the temperature in his city was 100.4° Fahrenheit one day, so it was too hot to play football outside. Kirk doesn't know how hot this is, because he is used to temperatures in Celsius. Help Kirk solve the following equation to determine the temperature in degrees Celsius: 1.8C+32=100.4.