If $x + \frac{1}{x} = 6$, what is the value of $\frac{x^2 - x + 1}{x^2 + x + 1}$?

Options:

  • A: $\frac{3}{4}$
  • B: $\frac{5}{7}$
  • C: $\frac{4}{5}$
  • D: $\frac{1}{2}$

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