get it question from physics.
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This is because the function of modulus is to give a positve value for any value that is put "INTO" the modulus. For example, |-a| = +a.
But when you add a negative sign before it, it is like multiplying a positive value with a negative number as the negative sign is "OUT" of the modulus.
For example, -|- x| = -(+x)= -x.
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