Sync computer track with existing track

I have a vocal and guitar track from a friend, and I sweetened it with a rhythmsection track on the computer. The original vocal track is not completely steady, it was recorded without a clic track. Is there an article how to sync the computer track with the audio track? I understand this will take changing the tempo in separate sections, probably by hand. How is this best done? (Yes, I understand it will be easier to ask my friend to rerecord the song with the backing track, but she’s abroad now…)

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