If the doorway wall has a header in it and is carrying the load from ceiling/floor above, there is probably a king stud and jack stud still supporting it. (Under the trim casing). The 3 studs are carrying a point load from above OR are just backing for the doorway (partition) drywall. It may just be blocking sandwiched between two studs if not loaded and you drilled through the solid blocking.
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17,000 dryer fires a year, when did you last clean the inside of the dryer near motor or the exhaust ducting?
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