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when are the absolute value and the opposite of a rational number equal?

Sagot :

Absolute value of X can be treated as a distance on the number line from zero to X, so it has no sign (or it's always positive, never negative).
For example 
[tex]|X|=X[/tex]
but also:
[tex]|-X|=X[/tex]

That means that the absolute value of a rational number and its opposite may only be equal, if the rational number is lower than 0 (see the example above). 
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