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

<gadget id="calculator">7 - 1</gadget>
<output>6</output>

<gadget id="calculator">63 + 6</gadget>
<output>69</output>

<result>69</result>