A fraction, if 3 is subtracted from the numerator, it will be (1/2) after simplification; if 6 is added to the denominator, it will also be (1/2) after simplification; what is this fraction.
一个分数，如果分子减去3，化简后是(1/2)；如果分母加上6，化简后也是(1/2)；这个分数是多少．
<gadget id="calculator">2 * 5</gadget>
<output>10</output>

<gadget id="calculator">10 - 6</gadget>
<output>4</output>

<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<result>5/4 = around 1.25</result>