Final answer:
The expressions x + 3 and 3 + x are equivalent using the commutative property of addition. Similarly, the expressions 3 - x and x - 3 are also equivalent.
Step-by-step explanation:
The given expressions are:
x + 3 = 3 + x
3 - x = x - 3
To solve these equations, we can use the commutative property of addition, which states that changing the order of the addends does not change the sum. This means that x + 3 is equivalent to 3 + x, and 3 - x is equivalent to x - 3.
Learn more about Commutative Property of Addition