\frac{(\sqrt7 - 2)(\sqrt7 - 3)}{(\sqrt7 + 3)(\sqrt7 - 3)} = \frac{(7 - 3\sqrt7 - 2\sqrt7 + 6)}7 - 9 = \frac{13 - 5\sqrt7}-2 = -\frac132 + \frac{5\sqrt7}2 - Dyverse