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I'm afraid it was correct as stated.
If x is a negative number, then | x | = − x.
If x is a negative number, then | x | = − x.
This is incorrect. It should read "If x is a negative number, then | - x | = x."
This is incorrect. It should read "If x is a negative number, then | - x | = x."
The latest change is an error. If x is a negative number, then -x is a positive number! It was correct before, the absolute value of x, where x is negative, is -x:
If x is negative, | x | = − x