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Explain why it does not matter what letter or symbol is used to find an unknown number

User Ebelisle
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The letter represents an unknown number. You use mathematics to solve for the missing number which is represented by the letter. Letters do not have a certain value, therefore it does not matter which letter is used.
User Tolmark
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because it's a variable. A variable is any letter that represents any unknown number. hopes this helps!
User JStw
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