Answer: The property which is illustrated by the given equation, is associative property of addition.
Explanation:
The associative property of addition states that the sum of three real number remains the same either start addition from first two numbers or last two numbers.
[tex](a+b)+c=a+(b+c)[/tex] ... (1)
The given equation is,
[tex](2+x)+3=2+(x+3)[/tex]
The above equation is same as equation (1)0, where the value of a, b and c are 2, x and 3 respectively.
And after simplifying the given equation we get,
[tex]5+x=5+x[/tex]
The left hand side is equal to right hand side. So, the associative property of addition is illustrated by the given equation.