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DUDE ITS SIMPLE 5 x 0 =-|
2 and 1 .their sum is 3 .difference is 1
'a' can be any number whatsoever. The sum of +a and -a is always zero.
Zero and 15.
There are infinitely many pairs of numbers whose difference is equal to the sum of 538 and 259 (which is 797). One such pair is 420 and 1217. Another pair is 0 and 797.