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Mathematics 17 Online
OpenStudy (anonymous):

|-21| = x

sam (.sam.):

|-a|=a |-21|=?

OpenStudy (texaschic101):

read this and you will have your answer... http://www.purplemath.com/modules/absolute.htm

OpenStudy (anonymous):

Go t mathway.com and type it in. It's best for solving stuff like that.

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