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I read that 要するに and つまり are not always interchangeable. Still, I don't really understand the difference between the two...

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The two can be interchangeable but where as 要するに means "To summarise" or "in short". つまり is usually taken to mean "in other words":

大敗した。要するに 力の差があった。

It was a big defeat. In short, there was big difference (in strength).

財布をなくした。つまり お金がない。

I have lost my wallet. In other words, I have no money.

There is a similar word to つまり、すなわち which also means "in other words" but is not interchangeable because it does not convey a a conclusion:

母の兄、 すなわち おじさん。| My mother's elder brother. In other words my uncle.

I explain this because (I think*) in the following sentence つまり is interchangeable with either 要するに or すなわち, illustrating the nuance you are asking about.

友人の仕事は危険で、汚くて、おまけに きついらしい。ちなみにそういう仕事は俗に「3K」と呼ばれている。要するに「き」、すなわち「K」が3つつくというわけだ。

I understand my friend's work is dangerous, dirty and hard. This kind of work, incidently is commonly referred to as 3Ks work. In short the 3 "ki"s or "K"s often come together.

*I should be grateful for if others would confirm correct me on this.

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Not 100% sure on this, but I think つまり is used more for rewording something, while 要するに is more for "summing up" the "preceding" statements into a "conclusion".

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