\[\sqrt[5]{3x^{2} + 4x + 5} = \sqrt[5]{5x^{2} - 4x + 3}\]
\[3x^{2} + 4x + 5 = 5x^{2} - 4x + 3\]
\[2x^{2} - 8x - 2 = 0\ \ \ \ \ |\ :2\]
\[x^{2} - 4x - 1 = 0\]
\[D = 4 + 1 = 5\]
\[x_{1} = 2 - \sqrt{5};\ \ x_{2} = 2 + \sqrt{5}\]
\[Ответ:x = 2 \pm \sqrt{5}.\]