\frac{L^{2}}{- 2 m E} \frac{1}{h^{2}} - \frac{G M m}{- E} \frac{1}{r} = - 1.

${\frac{L^2}{-2mE} \frac{1}{h^2} - \frac{GMm}{-E} \frac{1}{r} = -1.}$

Error