Take any number, we will refer to that number as n. Now:
-n+n=0
For example:
-1+1=0
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'a' can be any number whatsoever. The sum of +a and -a is always zero.
The two numbers whose sum is 58 and whose difference is 16 are 21 and 37.
.
17 and 3 are two prime numbers whose sum is 20. Their product is 51.
19