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    $\begingroup$ what does terms proportional to x mean? In what sense is (1+2 y) proportional to x $\endgroup$ Commented Apr 3, 2018 at 7:29
  • $\begingroup$ Sorry, I omitted the x term accidentally since that was what Coefficient was returning. I've edited the question. Thanks for pointing this out. $\endgroup$ Commented Apr 3, 2018 at 15:09
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    $\begingroup$ Perhaps Cases[Expand@expr, Longest[a_.] x /; FreeQ[a, x] :> a] works. $\endgroup$ Commented Apr 3, 2018 at 16:43
  • $\begingroup$ You mean the constant (for $x$) coefficients of $x^1$? $\endgroup$ Commented Apr 5, 2018 at 2:51
  • $\begingroup$ @march That seems to work! Thanks a lot! Feel free to post as an answer $\endgroup$ Commented Apr 6, 2018 at 7:44