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It is easy enough to do in Windows 10 and you have up to 30 days to make the decision to revert back to your old Windows 7. After those 30 days are up then you will be forced to reinstall your old OS from scratch.
Here is how you revert to the previously installed Windows 7:
1. Go to Settings>Update &security>Recovery.
2. Look for the Go back to Windows 7 entry.
3. Click on Get started and follow the prompts to go through the restoral process.
Once it is complete you will find your old Windows 7 operating system has been restored.