Add 10 to the numerator of (2/7), to keep the fraction size unchanged, add ﹙﹚ to the denominator.
给(2/7)的分子加上10，要使分数大小不变，分母应加上﹙﹚．
<gadget id="calculator">7 * 6</gadget>
<output>42</output>

<gadget id="calculator">42 - 7</gadget>
<output>35</output>

<result>35</result>