The sum of the numerator and denominator of a fraction is 18. If you add 8 to the numerator and 9 to the denominator, the new fraction will be (3/4), what is the original fraction?
一个分数的分子和分母的和是18，如果将分子加上8，分母加上9，新的分数约分后是(3/4)，原来的分数是多少．
<gadget id="calculator">18 + 8 + 9</gadget>
<output>35</output>

<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">35 * (3/7)</gadget>
<output>15</output>

<gadget id="calculator">15 - 8</gadget>
<output>7</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">35 * (4/7)</gadget>
<output>20</output>

<gadget id="calculator">20 - 9</gadget>
<output>11</output>

<gadget id="calculator">7 / 11</gadget>
<output>7/11 = around 0.636364</output>

<result>7/11 = around 0.636364</result>