3. A veterinarian surveys 26 of his patrons. He discovers that 14 have dogs, 10 have cats, and 5 have fish. Four have dogs and cats, 3 have dogs and fish, and one has a cat and fish. If no one has all three kinds of pets, how many patrons have none of these pets?
7 + 4 + 0 + 3 + 1 + 5 + 1 + x = 26 21 + x = 26 x = 5 patrons have none of these animals
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