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I have an expression that consists of functions of x and y, something like ay+yf(x)+g(x)+bh(x)+k(y). Is there a convenient method that removes all x-dependent terms and leaves ay+k(y)? f,g,h,k are symbolic and not known functions.

As far as I know, dependence in maxima [defined with depends()] is only recognized in diff. I tried diff and then integrate/antidiff, but antidiff/integrate does not recognize y and b as constant, and gives an expression with integrals.

That Frank Guy
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    `sublist(args(ee), lambda([e], freeof(x, e)))` returns a list of terms free of `x`, where `ee` is the original expression you showed. Then you can say `apply("+", foo)` where `foo` is that list. – Robert Dodier Jan 01 '22 at 21:29

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