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並前往https://www.quora.com/There-are-some-people-on-a-train-19-get-off-at-the-first-stop-17-get-on-Now-there-are-63-people-on-the-train-How-many-were-on-the-train-to-begin-with

There are some people on a train. 19 get off at the first stop. 17 ...

Let x=the number of ppl on the train at the start. Thus, x-19+17=x-2 represents that 19 got off while 17 got on. So, x-2=63 or x ...

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