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I can answer, but it'll be a bit dodgy. I can't remember the exact terms and definitions.
It is because the Moon also has a velocity around the Earth. Basically, this motion 'cancels out' the force by gravity - the Moon is being pulled towards the Earth, but it's circular (well, elliptical) orbit is also pulling it away from the Earth. The centrifugal force balances out the centripetal force.
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