Posted by Roger on Monday, January 7, 2013 at 10:56pm.
if you let u = e^x,
u-4 = -1/u
u^2 - 4u = -1
u^2 - 4u + 1 = 0
now just use the quadratic formula and if yuo get values for u, wind up with
x = ln(u) if defined
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