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Guest 7037866
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That gets a bit more convoluted... I mean, look at your example.OR... they just keep adding dice. When you have advantage and disadvantage, you roll 3d20 and take the middle roll.
"Okay, you have 3 advantage and 2 disadvantage, so roll 6d20, and use the third highest die."

Seriously, however, 3d20 take middle is a better way to run the game in general as it gets less swingy results.
If your net is advantage, you take the highest of the 3d20, which is about 15.5. If your net is disadvantage, you use the lowest, average 5.5 IIRC. This makes actual adv/dis truly a +5/-5 effect, similar to what you do with passive perception.
However, giving the impact, you'd want things that granted adv/dis more rare as they are pretty common now (especially advantage!!!).