For a simple fraction, if 3 is added to the numerator, it will be reduced to (1/3), and if 2 is subtracted from the denominator, it will be reduced to (1/4). What is the fraction?
一个最简分数，若分子加上3，约分后为(1/3)，若分母减去2，约分后为(1/4)，这个分数是多少．
<gadget id="calculator">9 - 2</gadget>
<output>7</output>

<gadget id="calculator">3 * 7</gadget>
<output>21</output>

<gadget id="calculator">21 + 9</gadget>
<output>30</output>

<gadget id="calculator">7 / 30</gadget>
<output>7/30 = around 0.233333</output>

<result>7/30 = around 0.233333</result>