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Substituting 1 for x in the equation \(5x + 3 = x \cdot 5 + 3\) is a test case for **The Commutative Property of Multiplication**.
In this equation, both sides simplify to the same expression regardless of the order in which we multiply, demonstrating that multiplication is commutative (i.e., \(a \cdot b = b \cdot a\)). Here, \(5x\) is equivalent to \(x \cdot 5\).