The Identity of Operations
The identity of an operation is defined as an action which results in the number being manipulated, remaining unchanged.
The identity for an addition and a subtraction is zero. If zero is added to or subtracted from a number, then the sum/difference obtained is that number.
Example
The identity for a multiplication and a division is one. If a number is multiplied or divided by one, the product/quotient obtained is that number.
Example

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