Add 14 to the numerator of (7/15), how much should be added to the denominator if the size of the fraction is to remain the same
(7/15)的分子加上14，如果要使这个分数的大小不变，分母应该加上多少
<gadget id="calculator">15 * 3</gadget>
<output>45</output>

<gadget id="calculator">45 - 15</gadget>
<output>30</output>

<result>30</result>