How to stop gurgle noise in kitchen sink?

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celife

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I've noticed in the last week that my kitchen sink (upstairs) makes a gurgling noise when either my shower (upstairs) or washing machine (downstairs) is on. Any ideas on why this is and how to fix it?
 
The kitchen sink does not have an AAV. Air bubbles seem to be coming up via the drain. I should also add that I've lived here 12 years & this is the first time this has happened.
 

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