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https://uknowit.uwgb.edu/page.php?id=82920
Anyway, for your question. You need either a physical Mixer or Apps like Voicemeeter/Audio Router.
I would suggest Voicemeeter since it also can put the Audio to Mono etc.
It's just a bit of a pain to setup if you never have done it.
https://vb-audio.com/Voicemeeter/banana.htm (its free aka donationware)
Might help for Setup:
https://streamlabs.com/content-hub/post/split-audio-using-voicemeeter-banana
https://community.xsplit.com/t/guide-splitting-music-sources-using-voicemeeter/562