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A survey in 2000 showed that 5,560 people in my city owned a dog and 1,720 people in my city owned a cat. Since then, dog ownership in my city decreased by 380 people annually while cat ownership increased by 260 people annually. After how many years would the number of people owning a dog equal the number of people owning a cat?
a.6 years
b.5 years
c.5.5 years
d.6.5 years​