The lens formula is given by:
$$\frac{1}{o} + \frac{1}{i} = \frac{1}{f}$$
where $o$ is the object distance, $i$ is the image distance, and $f$ is the focal length. For the first lens, we can write this as:
$$\frac{1}{o_1} + \frac{1}{i_1} =
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