You need to one or the other of the following:
- Donwload the free Adobe DNG Converter version 9.3, use that to convert your RAW to DNG, then import the DNG into Lightroom 3
- Purchase Lightroom 6/Lightroom CC 2015
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Adding to the above post.
DNG Converter 9.3 Download link:
Hope that helps.
You can Download the DNG converter here:
Older versions of Lightroom do not support RAW files from new cameras. Lightroom 6 is required to process NEF files from the D7200, but as suggested above you can use the Adobe DNG converter to generate a DNG file from the NEF file and the DNG file is supported in Lightroom 3.