I live in a mobile home. I have a double sink with disposal on the left side.
The water will not go down the regular side of the sink. It is backing up into the disposal. I used a plunger and the water transfers between both side. I removed and snaked the line for about 15 feet. Half filled the sink and the water backed up into the disposal side.
What next ?

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I used a plunger and the water transfers between both side.

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your plunger acted like a pump moving the water from one side of the sink to the other.

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I removed and snaked the line for about 15 feet.

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if you removed the trap and snake from there with no results. Then snake from the kitchen roof vent.
Let me know how you make out. Good luck, Tom