If $a$, $b$, and $c$ are integers satisfying $a + \frac 1b = \frac{22}{7}$, $b + \frac 1c = 8$, and $abc = 21$, then find $c + \frac 1a$. Express your answer as a common fraction.
<|im_start|>system
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<|im_start|>user
If $a$, $b$, and $c$ are integers satisfying $a + \frac 1b = \frac{22}{7}$, $b + \frac 1c = 8$, and $abc = 21$, then find $c + \frac 1a$. Express your answer as a common fraction.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
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If $a$, $b$, and $c$ are integers satisfying $a + \frac 1b = \frac{22}{7}$, $b + \frac 1c = 8$, and $abc = 21$, then find $c + \frac 1a$. Express your answer as a common fraction.
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