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CD = 3

Step-by-step explanation:

If B is the midpoint of AC, AB and BC are equal.  BC = 2, so that means AB = 2.  This means AC = 4.  If the whole line = 7, then CD, the only segment we don't know, = 7 - 4, which equals 3.

if you love me then answer is CD = 3

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step-by-step explanation: