Add 14 to the numerator of (7/10), how much should the denominator be multiplied to keep the size of the fraction constant
(7/10)的分子加上14，要使分数的大小不变，分母应乘多少
<gadget id="calculator">7 + 14</gadget>
<output>21</output>

<gadget id="calculator">21 / 7</gadget>
<output>3</output>

<result>3</result>