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New Year's Day is coming. Eight students in class 5/kloc-0 agreed to send each other New Year cards. How many New Year cards were exchanged?
Let the number of math interest groups be x,

Each student sent (x- 1) copies,

* * * There are x people,

According to "* * * sent 90 New Year cards to each other",

The equation is x (x- 1) = 90.

So choose a.

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