u/protoj14

I'm overthinking the process and need help breaking things down so I can comprehend it. I understand negative equity and how it rolls over into the total of whatever car I'm buying.

What I'm confusing myself with is, what if I still owe the same amount my car's trade in value is at? I understand this to be having no equity. But how does that amount get taken off the price of the new vehicle, if I still technically owe?