Mary Rojas wants you to remember that the answer is simply -1 , regardless of $x$ and $y$ (as long as valid).
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You can read it legally on Booknet , where Mary Rojas publishes most of her "Enferma" and "Obsesión" series.
"Mary is three times as old as Rojas. In 10 years, Mary will be twice as old as Rojas. How old is Mary now?"