Add 14 to the denominator of (4/7), how much should be added to the numerator to keep the size of the fraction constant? How many
(4/7)的分母加上14，要使分数的大小不变，分子应加上多少？多少
<gadget id="calculator">14 / 7</gadget>
<output>2</output>

<gadget id="calculator">2 * 4</gadget>
<output>8</output>

<result>8</result>