Even and Odd Functions

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The function $f (x) = lo g (x + x^{2} + 1)$ , is

If $f$ is an even function defined on the interval $(- 5, 5)$ , then four real values of $x$ satisfying the equation $f (x) = f (\frac{x + 1}{x + 2})$ are ........., ........., ........., and .........