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|3|=3. The absolute value, or "modulus" operator, just removes the negative sign basically. It's actually defined by cases

|x|= { if x>0 then x

{ if x<0 then -x

Don't confuse this with cardinality from set theory.

NOTE: in the second case x is negative, for example -2, so multiplying it by a negative gives a positive, same example -(-2) = 2.

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