The Guide shows you Step-by-Step How to Install MongoDB NoSQL Database Community Edition Release for Debian 7 Wheezy Lxde i386/amd64 Desktop.
Finally, the post’s Content is Expressly Reduced to Give Focus to the Essentials Instructions and Commands.

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Open a Terminal Window
(Press “Enter” to Execute Commands)In case first see: Terminal QuickStart Guide.
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SetUp Apt Repo for Latest MongoDB Installation:
MongoDB Apt Repo Setup