-3 and 3
Both |-3| and |3| equal 3.
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In Real numbers, each is the additive inverse of the other.
Yes, they can. If x is a non-zero rational number then x and -x will have the same absolute value.
Any number (other than 0), and its additive inverse.
The answer depends on the operation. The absolute value of 2/3 is not the same as the absolute value of 3/2! It does work for subtraction, though.
No. That is only true for non-negative numbers. The value of a negative number, such as -3 , is negative 3. But its absolute value is 3.