The sum of the numerator and denominator of a fraction is 63, which is (2/7) after simplification. What is the original fraction?
一个分数的分子与分母的和是63，化简后为(2/7)，原分数是多少．
<gadget id="calculator">2 + 7</gadget>
<output>9</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">7 / 9</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">63 * (7/9)</gadget>
<output>49</output>

<gadget id="calculator">(2/9) / 49</gadget>
<output>2/441 = around 0.004535</output>

<gadget id="calculator">63 * (2/441)</gadget>
<output>2/7 = around 0.285714</output>

<result>2/7 = around 0.285714</result>