There is a fraction. Adding 5 to the numerator can be divided into (11/18), and subtracting 5 from the numerator can be divided into (1/3). Find the original fraction.
有一个分数，分子加5可约分为(11/18)，分子减5可约分为(1/3)，求原来的分数．
<gadget id="calculator">17 - 5</gadget>
<output>12</output>

<gadget id="calculator">3 * 12</gadget>
<output>36</output>

<gadget id="calculator">17 / 36</gadget>
<output>17/36 = around 0.472222</output>

<result>17/36 = around 0.472222</result>