An alien species from another planet used the symbol below to represent a certain fraction. <br> ß <br> The symbol was used in the sentence below. <br> ß ÷ $$1\frac{3}{4} - \frac{2}{3}=\frac{5}{9}$$ <hr> What is the denominator of the symbol? <br> <input min="0" type="number" id ="imp6pg068q13_1" class="lineinput" placeholder="?" />