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In the following equations system: $\sqrt{x} - \sqrt{y} = log_{3}\frac{y}{x}$ $2^{x + 2} + 8^{x} = 5 \times 4^{y}$

How much is $x + y$?

This question was taken from IME (Instituto Militar de Engenharia - Brazil) 2014 Entrance Exam.

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