There is a fraction, adding 7 to the numerator can be reduced to (3/4); subtracting 3 from the numerator can be reduced to (1/2). What is the original score.
有一个分数，分子加上7，可约简为(3/4)；分子减去3，可约简为(1/2)．原来这个分数是多少．
<gadget id="calculator">2 * 23</gadget>
<output>46</output>

<gadget id="calculator">46 - 6</gadget>
<output>40</output>

<gadget id="calculator">23 / 40</gadget>
<output>23/40 = around 0.575</output>

<result>23/40 = around 0.575</result>