The formula [tex]C=\frac{5}{9}(F-32)[/tex] expresses the relationship between Fahrenheit temperature, [tex]F[/tex], and Celsius temperature, [tex]C[/tex]. Use the formula to convert [tex]68^{\circ} F[/tex] to its equivalent temperature on the Celsius scale.
[tex]68^{\circ} F = \square^{\circ} C[/tex]