When the temperature in celsius becomes equal to Fahrenheit?

Celsius and Fahrenheit are two scales predominately used in the United States whereas Celsius is
used worldwide. In a range of Celsius scale, the boiling and freezing points are equal apart to
100 degrees, hence unit in Fahrenheit 5/9 is Celsius scale. At only a single point of
intersection at -40 °C and -40 °F, both the scale range is equal.