The number, 0 is nothing, so some number + 0 is that number.
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Any negative number.
== The sum of any number and zero is that number.(2+0== 2) == the sum of any number and zero is that number. (2+0=2)
Zero can be expressed as the sum of any two opposite mixed number.
Yes
'a' can be any number whatsoever. The sum of +a and -a is always zero.