There is a fraction, if adding 8 to the denominator equals (3/10), and subtracting 8 from the denominator equals (1/2), what is the original fraction?
有一个分数，若分母加上8等于(3/10)，分母减去8就等于(1/2)，原来这个分数是多少？
<gadget id="calculator">2 / 1</gadget>
<output>2</output>

<gadget id="calculator">2 * 12</gadget>
<output>24</output>

<gadget id="calculator">24 + 8</gadget>
<output>32</output>

<gadget id="calculator">12 / 32</gadget>
<output>3/8 = around 0.375</output>

<result>3/8 = around 0.375</result>