The property of real numbers illustrated by the equation 2 + 5 = 7 is known as the Commutative Property of Addition. This property states that the order in which two numbers are added does not change the sum. In other words, if you have two numbers, say a and b, the equation a + b will yield the same result as b + a.
For example, in the equation 2 + 5 = 7, if we switch the order of the numbers, we get 5 + 2, which also equals 7. This fundamental property is one of the key characteristics of addition in the real number system and is applicable to all real numbers.