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Algebra Level 2

27x27y=249x+3x+y+9y=63x3y= ?\large { \begin{aligned}27^x - 27^y &=& 24\\ 9^x + 3^{x+y} + 9^y &=& 6 \\ 3^x - 3^y &=& \ ? \end{aligned}}

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