problem with sovlign aquation with argument x/w

*To*: mathgroup at smc.vnet.net*Subject*: [mg111184] problem with sovlign aquation with argument x/w*From*: SNC <snc at irc.pl>*Date*: Fri, 23 Jul 2010 07:09:58 -0400 (EDT)

How can i solve equation of type -d^2/dx^2\psi(x/2)=1/4psi(x/2), the problem is i cant use x/2 as an argument. Please help.