Dense orbit in real linear fractional transformation

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Consider $f:\mathbb{R} \backslash \{-2\}\to \mathbb{R}$ defined as $f(x)=\frac{x-1}{x+2}$. Is there a real number that the orbit $\{f(r), f\circ f(r), \cdots\}$is dense in some interval? If there is, can you classify them?

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Identically we have $f^7=f$, hence all orbits are finite.