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Mathematics 23 Online
OpenStudy (anonymous):

How do I write an expression for numbers I dont know?

OpenStudy (saifoo.khan):

x

OpenStudy (anonymous):

any letter

OpenStudy (saifoo.khan):

use 'x' to represent them

OpenStudy (saifoo.khan):

No, not any letter. DONT use the letter u get in your mail box.

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