additive identity matrix by one.
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(4=-5)+5=5
Commutative
In an addition or multiplication problem, the commutative property allows you to be able to swap as many numbers around in the sum as you wish, and for the answer to remain the same. For example, 5 x 4 = 20 and 4 x 5 = 20. Similarly, in an addition sum, 5 + 4 = 9, and 4 + 5 = 9.
A # that is + and is= ex 5=5
The Commutative property of addition states that 5 + 7 = 7 + 5