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I was at a pet owners’ convention yesterday. The convention advised pet owners to bring one pet only to avoid any unnecessary commotion.

Dog owners brought along one dog only, and cat owners brought along one cat only.

However, owners who had both animals brought along a dog and a cat.

There were 10 owners. A total of 76 legs were counted when counting all of the legs of the owners, dogs and cats together.

How many pet owners brought along only one pet?