That depends what the question is! The equation is true whenever x and y have the same value; false otherwise.
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Transitive property: If 8 equals x and x equals y, then 8 equals y.
x=y
The result of the equation x + 2y - 2x - y equals x simplifies to y - x.
x=4 y=4
No. In fact, under normal rules of operation, x-y equals y-x only when x = y.