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Simplify. Assume all variables are positive.$\newline$$r^{\frac{12}{7}} \cdot r^{\frac{9}{7}}$$\newline$Write your answer in the form $A$ or $\frac{A}{B}$, where $A$ and $B$ are constants or variable expressions that have no variables in common. All exponents in your answer should be positive.$\newline$______