For any three real numbers a, b, c such that (a + b) + c = a + (b + c) is?

For any three real numbers a, b, c such that (a + b) + c = a + (b + c) is?

Explanation

The given equation (a + b) + c = a + (b + c) is the standard form of the Associative Property of Addition.

It states that the grouping of numbers in an addition operation does not change the sum.