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This should be fixed in Sage 5.0, because of Trac 10682. Compare the following (old and new versions of Maxima):

Maxima 5.23.2 http://maxima.sourceforge.net
using Lisp ECL 11.1.1
Distributed under the GNU Public License. See the file COPYING.
Dedicated to the memory of William Schelter.
The function bug_report() provides bug reporting information.
(%i1) solve(x*%e^x=0,x);
                                         x
(%o1)                          [x = 0, %e  = 0]

Maxima 5.26.0 http://maxima.sourceforge.net
using Lisp SBCL 1.0.24
Distributed under the GNU Public License. See the file COPYING.
Dedicated to the memory of William Schelter.
The function bug_report() provides bug reporting information.
(%i2) solve(x*%e^x=0,x);
(%o2)                               [x = 0]