A simple fraction, if you add 3 to its numerator, it is equal to (2/3); if you subtract 2 from its denominator. Then it is equal to (1/2). What is the original score?
一个最简分数，若将它的分子加上3，则等于(2/3)；若将它的分母减去2．则等于(1/2)．原来这个分数是多少？
<gadget id="calculator">9 - 4</gadget>
<output>5</output>

<gadget id="calculator">4 - 3</gadget>
<output>1</output>

<gadget id="calculator">5 / 1 / 12</gadget>
<output>5/12 = around 0.416667</output>

<result>5/12 = around 0.416667</result>