This is a quadratic equation in . To make it easier substitute to give
(2u-1)(u+2) = 0 so u = 0.5 or u = -2
ie: in which case we can take the reciprocal of both sides to give us . You'll get an error if you try solving so this is not a real solution.
Again take the reciprocal to give
this gives and
This is the only solution if I've plotted my graph right