Solved! One part of my cable (earbuds) has 2 wires, while the other has 3

Feb 3, 2019
One of the cables of my earbuds got cut. I'm planning on soldering the wires back together, but one part of the cable (the one leading the earbud itself) has 2 cables: one blue, the other copper. The other side (the one leading to the rest of the cables) has 3 cables: one red, one blue, and one copper.

I've looked at what each color does, and I've found out that the blue could be for either left or right, same for the red, and that the copper is some kind of noise shield. How do I connect the two sides?
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