原稿：（事实上是11-21的）
I met a complex math problem. It confused me for more than one hour until I suddenly found a very easy solution. I was happy when I found it, but if I met a problem as complex as this one, I want to find the solution earlier.
Correctly:
I met a complex math problem. It confused me for one hour more until I suddenly found a simple solution. I was happy when I discovered it, but if I meet a problem as complex as this one next time, I want to find the solution earlier.
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