'a' can be any number whatsoever. The sum of +a and -a is always zero.
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-1+1=0
Zero and 15.
a2+16 cannot be factored. There are no two numbers whose product is 16 and whose sum is 0.
-2 and 2 equals zero and pretty much anything else oposite
Take any number, we will refer to that number as n. Now: -n+n=0 For example: -1+1=0