So, what does "x" after INT does?

Answer 1

E.L
Continue with the tutorial for now,. As it seems, you just got started, so many questions arises, it's fine, but try to continue with tutorial, practice along the way, and check out lesson comments (sometimes help).

About the question, the <x> is a variable name, `int` is the data type. Combined together they clearly identify something, like "dog willy" -> a dog (type) named 'willy'

Answer 2

Less info
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https://www.sololearn.com/discuss/333866/?ref=app