Question: Please help and show steps and work. I will thumbs up immediately When an object is 5.4 cm away from a mirror, the real image
Please help and show steps and work. I will thumbs up immediately

When an object is 5.4 cm away from a mirror, the real image is 12.9 cm away from the mirror. Calculate the focal length of the mirror. (Give your answer in centimeters but don't include the units.)
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