Edit the system environment variables (How to restore?)

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Occasional Visitor

I accidentally deleted the path of System Variables (Control Panel\System and Security\System\Advances system settings\Environment Variables\System Variables). 

I wanted to add the path of python27. 

Now, when I run the command line and run python then I am still getting an error('python' is not recognized as an internal or external command, operable program or batch file.)

I don't even know what path I have deleted. 

Is there any way to restore the path which I have deleted?

What's the way to run python in the command line?

 

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