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Let's assume the population of Chicago to be "x" million people.
According to the given information, the population of New York City is about 9.9 million more people than the population of Chicago. Therefore, we can write the equation:
x + 9.9 = 18.8
To find the approximate population of Chicago, we can solve this equation:
x = 18.8 - 9.9
x = 8.9
Hence, the approximate population of Chicago is 8.9 million people.