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In mathematics, identity is a transformation that leaves an object unchanged. In addition and subtraction, the identity element is zero. Adding or subtracting zero to or from a number will leave the original number. In multiplication and division, the identity element is one. Multiplying or dividing a number by one will leave the original number.
There is no form of reflection that flips one point on a line and leaves the rest of the line unchanged.
You do nothing! Two halves = 1 and division by 1 leaves the number unchanged.
Any number divided by one leaves the number unchanged. Thus 10 / 1 = 10
15 take away 4 is equal to 11. This is a simple subtraction operation where you are removing 4 from the original number, which leaves you with the result of 11. Subtraction is the inverse operation of addition, and in this case, you are subtracting a smaller number from a larger number.