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Hello, While I am not completely new to linux since I used Ubuntu for about a year, I am new to Mint, and one thing I can figure out when compared to Ubuntu, is how to add repositories. I mean, there is no Software Sources app in Mint, am I right?
You should still have Synaptic in Mint (not sure about 7) but my favorite way is just through the command line. sudo gedit /etc/apt/sources.list then just paste the repo address at the bottom. You can replace gedit with any other text editor (vi, nano, abiword etc.)
It's been awhile since I've added any repos, but I remember looking though the tutorials and thinking this was a lot harder than it should be then I found apt-key. I'm pretty sure sudo apt-key add [filename] will take care if it.