Flushing one toilet causes another toilet to refill?

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ryanjg117

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I purchased an old tri-level house with two upper bathrooms, both sharing the same wall with (my guess) the same plumbing lines coming to both toilets.

When we flush the toilet in the hallway, I've noticed the toilet in our master bath also makes a "recovery" sound for a number of seconds.

Both of these bathrooms are old, built in the late 70s with no updates... I'll be updating these bathrooms in the near future.

Any hunches as to why this might be happening, if it matters, and how I can prevent it?
 

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