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There better be a P trap for the washing machine. That looks like a newer house so it is usually in wall. Snake it from there. I bet is lint along with a combination of other stuff like fat and food that cause the clog. Again, it may not be that depending if the kitchen drains before the washing machine or not. Often there's not enough water to flush toilet paper down into the main stack so it get stuck and cause all kinds of trouble. You need to snake the drain. Time to call the smell good Plumber (Radio commercial joke around here).
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