Question: Let x , y be variables whose domain is the set of real numbers . Which result of first - order logic justifies the statement

Let x, y be variables whose domain is the set of real numbers . Which result of first-order logic justifies the statement below?
xy (x + y =0) is logically equivalent to yx (x + y =0)
Group of answer choices
Definability laws
De Morgans laws
Distributive laws
Commutative laws

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