xx, yy, and xx-ponents

Algebra Level 1

If 4x2x+y\frac{4^{x}}{2^{x + y}} =8= 8 and 9x+y35y\frac{9^{x + y}}{3^{5y}} =243= 243, where xx and yy are real numbers, then what is the sum x+yx + y?

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