A fraction, after adding 3 denominators to the numerator is (2/3), and after subtracting 3 denominators from the numerator, it is (1/6). What is this score?
一个分数，分子加上3约分后为(2/3)，分子减去3约分后为(1/6)．这个分数是多少？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(2/3) + (1/6)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">(5/6) / 2</gadget>
<output>5/12 = around 0.416667</output>

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