A fraction can be approximately (1/3) if the numerator is subtracted by 2, and it can be approximately (2/3) if the numerator is added by 3. What is the original fraction?
一个分数，如果分子减2则可约为(1/3)，如果分子加3可约为(2/3)，原分数是多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(2/3) - (1/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">(1/3) / 5</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/15) * 2</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">(1/3) + (2/15)</gadget>
<output>7/15 = around 0.466667</output>

<result>7/15 = around 0.466667</result>