its really not that bad, there are 3 tabs up top that let you switch between multitrack edit and something else
choose multitrack, right click on timeline import, import audio from video.

then once its on the time line double click the audio and it will take you into edit mode

Then goto effects, amplitude, channel mixer, and there are 2 options that will goof for your issue, depending on what channel has the audio, both = left or both = right. then apply

file save as windows pcm wavform file and bring the audio track back into the editing program. Then erase your old audio track and use this one

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