(%i1) display2d: false $
(%i2) eq: 8x^^(-1)+1/2-x $
(%i3) solve(eq,[x]);
(%o3) [x = (16x^^(-1)+1)/2]
(%i4) buildinfo();
(%o4) %buildinfo("5.39.0","2017-02-11 15:57:57","x8664-pc-linux-gnu",
"CLISP",
"2.49 (2010-07-07) (built 3690787047) (memory 3695806678)")
Sorry, please delete this post: I simply put ^^ where just ^ must have been.
OK, I'm closing this as wont-fix.