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To convert a temperature measured in degrees Fahrenheit to degrees Celsius, there is a formula:

$\displaystyle{ C={\frac{5}{9}\!\left(F-32\right)} }$

where $C$ represents the temperature in degrees Celsius and $F$ represents the temperature in degrees Fahrenheit.

If a temperature is $23 {^\circ}\text{F}$ , what is that temperature measured in Celsius? Use degC for $^{\circ}\text{C}$ and degF for $^{\circ}\text{F}$ .