Solve for x
x=\frac{14\left(-\sqrt{7}\cos(\frac{\arccos(\frac{247\sqrt{7}}{2401})}{3})-2\right)}{9}\approx -6.849117457
x=\frac{7\left(\sqrt{7}\left(\sqrt{3}\sin(\frac{\arccos(\frac{247\sqrt{7}}{2401})}{3})+\cos(\frac{\arccos(\frac{247\sqrt{7}}{2401})}{3})\right)-4\right)}{9}\approx 0.249262278
x=\frac{7\left(\sqrt{7}\left(-\sqrt{3}\sin(\frac{\arccos(\frac{247\sqrt{7}}{2401})}{3})+\cos(\frac{\arccos(\frac{247\sqrt{7}}{2401})}{3})\right)-4\right)}{9}\approx -2.733478154
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