Given:
Object distance, u = -12 cm (since it is in front of the lens)
Focal length, f = -20 cm (for a diverging lens)
Using the lens formula:
\[\frac{1}{f} = \frac{1}{v} + \frac{1}{u}\]
\[\frac{1}{-20} = \frac{1}{v} + \frac{1}{-12}\]
\[-\frac{1}{20} = \frac{1}{v}
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