☆/8=9...〇, to make the number in 〇 the largest, how much should ☆ be.
☆/8=9…〇，要使〇里的数最大，☆应是多少．
<gadget id="calculator">8 * 9</gadget>
<output>72</output>

<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">72 + 7</gadget>
<output>79</output>

<result>79</result>