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fixed logic error, though the language sounds a little odd.
:If <math>x</math> is a positive number, then <math>|x| = x</math>.
:If <math>x</math> is a positive number, then <math>|x| = x</math>.
:If <math>x</math> is a negative number, then <math>|x| = -x</math>.
:If <math>x</math> is a negative number, then <math>|-x| = x</math>.
:If <math>x=0</math> then <math>|x| = 0</math>.
:If <math>x=0</math> then <math>|x| = 0</math>.