In one exam, the average score of 7 people including Mingming was 78 points, the highest score was 97 points, the lowest score was 64 points, Mingming was 88 points, 3 of the remaining 4 people had the same score, and the average score of the 5 people with different scores was 78 points. The score is 80. Dongdong is neither the highest score nor the lowest score. It is different from other people's scores. How many points did Dongdong get?
有一次考试，明明等7人的平均分是78分，其中最高分是97分，最低分是64分，明明是88分，其余4人中有3人分相同，分数各不同的5人平均分是80．东东不是最高分也不是最低分，与别人的分都不同，东东得了多少分？
<gadget id="calculator">7 * 78</gadget>
<output>546</output>

<gadget id="calculator">546 - 97 - 64 - 88 - 73 - 73 - 73</gadget>
<output>78</output>

<result>78</result>