When I use Maple solve on functions that involves exp, ln to decide the maxima, minima points by solving derivative equals zero, it only returns the first point, not the second point.
Which by definition it shall return two points, one at 2.030837315, the other around 6.7.
See the Maple code and exported PDF attached.
It turned out this is a system issue. I use Maple 2015.2 on Windows 10 64bit.
The problem got magically solved after a Windows reboot.