what is wrong with this? It runs forever and never displays anything on the screen.
NSolve[{E^-k == (Cg + m)/(Cs - (Cs/q) + ((E^(\[Theta]q\[Alpha]E^(-k))
-1)/(q\[Theta]E^(-k) \[Tau] (E^(\[Theta]q\[Alpha]E^(-k)) + \
\[Tau] - 1)))) \[Tau] + (\[Alpha]/\[Tau]) + m,
(E^(\[Theta]q\[Alpha]E^-k) - 1)/(\[Tau] +
E^(\[Theta]q\[Alpha]E^(-k)) -1) == \[Theta]E^(-k) \[Tau] (Cs + (q\[Beta]/(1
-E^(-k) \[Tau])^2)) /. {q -> 0.5, \[Alpha] -> 4, Cg -> 5,
m -> 5, Cs -> 7, \[Beta] -> 0.5, \[Theta] -> 0.3}}, {\[Tau], k}, Reals]