They are variables or unknowns and are used in algebra.
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Yes, it can be.
A variable
A letter that is used in place of a number is called a variable.
Roman numerals use letters in place of numbers. An unknown variable in algebra uses a letter instead of a number.
if there is a letter (example n, z ) instead of a number in algebra it stands in place of that number. this means if you are doing multiplication you are going to divide the numbers to get the answer for your letter . if you are doing division you do it the other way around! easy