If the equation (4/9)/((5/6)-(5/12)*□)=(8/13) holds true, then what number should be filled in □.
如果等式(4/9)/((5/6)-(5/12)*□)=(8/13)成立，那么□中应填的数是多少．
<gadget id="calculator">4 / 15</gadget>
<output>4/15 = around 0.266667</output>

<result>4/15 = around 0.266667</result>