Based on the given information and the properties of congruent triangles, we need to determine the length of \( AB \) based on the triangle \( \Delta DBE \) with the specified side lengths.
The side lengths of triangle \( \Delta DBE \) are:
- \( DB = 12 \) units
- \( BE = 7 \) units
- \( DE = 14 \) units
Since we have no specific visual reference to the triangle \( \Delta ABC \) in the question, we might rely on relational congruence. However, we can't infer any relationship between the triangles without additional information about how \( A, B, C \) correlate to \( D, E \).
If the triangles \( \Delta ABC \) and \( \Delta DBE \) are congruent (given any specific markings or angles that suggest this), the lengths of corresponding sides would be equal.
In this case, we can find that \( AB \) corresponds to \( DE \) (if \( \Delta ABC \sim \Delta DBE \)). Thus, if \( DE = 14 \) units, \( AB \) would also equal \( 14 \) units.
Therefore, the length of \( AB \) is 14 units.
So, the correct response is: 14 units
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