Yes. Just pick any number for x and any number for y and you will see.
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This is the reflexive property of "equality"
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It equals x+5y simplified
That is irrelevant, there is not possible way y=xy, and there is no possible way xy=x.
x = -2 and y = 3
Here x is equls to 9 and y is equal to 4
(5, 0)