What is the sum of all real numbers $x$ that are not in the domain of the function $$f(x) = \frac{1}{x^2-7} + \frac{1}{x^3-8} + \frac{1}{x^4-9}~?$$
<|im_start|>system
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<|im_start|>user
What is the sum of all real numbers $x$ that are not in the domain of the function $$f(x) = \frac{1}{x^2-7} + \frac{1}{x^3-8} + \frac{1}{x^4-9}~?$$
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
2
What is the sum of all real numbers $x$ that are not in the domain of the function $$f(x) = \frac{1}{x^2-7} + \frac{1}{x^3-8} + \frac{1}{x^4-9}~?$$
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