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Give the domain of $\displaystyle \frac{{{x}^{{2}}-{5}{x}+{1}}}{{{x}^{{2}}-{9}{x}+{20}}}$ using interval notation.

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Enter your answer using interval notation. Example: [2.1,5.6172)
Use U for union to combine intervals. Example: (-oo,2] U [4,oo)
Enter DNE for an empty set. Use oo to enter Infinity.