6:6a even if he lives a thousand years twice over but fails to enjoy his prosperity.

And that is true even if he lives for 2,000 ⌊(two thousand)⌋ years, but does not enjoy his wealth.
-or-
Even though he might live for countless years, yet he would still never experience anything good ⌊during his life⌋ .

6:6b Do not all go to the same place?

Would he not die like everyone else? ⌊Yes!⌋
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He would die just like everyone else.
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He would go to his grave as all people do.

6:6a-b (combined)

Even if someone lived two thousand years ⌊which is impossible⌋ , but didn’t enjoy anything, what’s the point? Don’t we all end up in the same place? ⌊Yes, we do!⌋
-or-
You may live for a very long time, but you may not enjoy your life. We all go to the same place after we die. This is what will happen. Remember that. (Easy English Bible)

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