SOLUTION: what the need of x

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Question 4719: what the need of x
Answer by rapaljer(4667) About Me  (Show Source):
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To represent an unknown number, while you are in the process of finding it, usually by solving an equation in which x is involved. Any letter besides x would do, but in algebra, x seems to be the favorite letter to serve as a variable, an unknown that is yet to be determined.

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