7 8 9 10 = 24 fill in the operation symbol can not change the position

I tried, and the following method is feasible
7 + 8 + 9 % 10 = 24
If you take 10 out of 9, you will get 9, so the above formula will become 9
7 + 8 + 9
The result is not 24. What is it

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