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Find the value of x.
In circle O, a chord that falls from left to right has length x. A line segment from O to the chord rises from left to right, forms a right angle with the chord, and has length 7. A second chord is horizontal. A vertical line segment from O to this second chord has length 7 and divides the chord into two parts. Each part has a tick mark, and the left part has length 6.
x=