□/9=7…△, when △ is the largest, what is □.
□/9=7…△，当△最大时，□是多少．
<gadget id="calculator">7 * 9</gadget>
<output>63</output>

<gadget id="calculator">9 - 1</gadget>
<output>8</output>

<gadget id="calculator">63 + 8</gadget>
<output>71</output>

<result>71</result>