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  • $\begingroup$ This is the best answer, I think (+1). But do you really need HoldFirst? $\endgroup$ Commented Aug 3, 2013 at 5:18
  • $\begingroup$ @Jens This changes the order of all the other terms, which in my understanding is not desired. I believe all but the last expression should agree with {x^2 + x + 5, -x^2 + x + 5, x^2 + x, -x^2 + x} // TraditionalForm. That is to say, it should match my answer. $\endgroup$ Commented Aug 3, 2013 at 5:19
  • $\begingroup$ @Mr.Wizard You're right. I thought Sort on blocked Plus is a clever idea, but it doesn't quite do what's needed either. $\endgroup$ Commented Aug 3, 2013 at 5:24
  • $\begingroup$ @Jens, Mr. Wizard good catches - guess I should have done more testing. $\endgroup$ Commented Aug 3, 2013 at 5:33
  • $\begingroup$ @Jens moreover, it fails with -x + 1. $\endgroup$ Commented May 23, 2014 at 9:52