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Mars has a mass of about 6.59 × 1023 kg, and its moon Phobos has a mass of about 9.4 × 1015 kg.

If the magnitude of the gravitational force between the two bodies is 4.35 × 1015 N, how far apart are Mars and Phobos? The value of the universal gravitational constant is 6.673 × 10−11 N · m2/kg2.
Answer in units of m

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