Because 0 has no definite value.
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This is the Identity Property so it is the the Additive Identity and Multiplicative Identity.
A negative or positive number remains unchanged when divided by zero.
When zero is added to any number, it remains unchanged. 5 + 0 = 5 6 + 0 = 6 7 + 0 = 7
zero + zero = zero
It's the Identity Property of Zero.