\displaystyle x_{OH}=e^{\frac{t\sqrt{2\sqrt{5}+\sqrt{19}}}{2}}(\alpha cos(\frac{t\sqrt{2\sqrt{5}-\sqrt{19}}}{2})+\beta sin(\frac{t\sqrt{2\sqrt{5}-\sqrt{19}}}{2})) +e^{-\frac{t\sqrt{2\sqrt{5}+\sqrt{19}}}{2}}(\gamma cos(\frac{t\sqrt{2\sqrt{5}-\sqrt{19}}}{2})+\delta sin(\frac{t\sqrt{2\sqrt{5}-\sqrt{19}}}{2}))