Adding to a negative number a positive number with an absolute value of 1 less than the original one.
Illustrative Example:
If we add to a negative number a positive number with an absolute value of 1 less than the original one, then the sum will be negative 1.
Proof
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If we add to a negative number a positive number with an absolute value of 1 less than the original one, then the sum will be negative 1.
Illustrative Example: