Yes, it can be.
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A variable
They are variables or unknowns and are used in algebra.
Yes, it is.
The gender of the pronoun 'it' is neuter, a word that takes the place of a noun for a thing that has no gender.The number of the pronoun 'it' is singular, a word that takes the place of a noun for one thing.
When you do not know the value of a particular number, the most usual symbol used in place of that number is the letter x.