∀ {R : Type u_3} {S : Type u_1} (M : Type u_2) [inst : Semiring R] [inst_1 : Semiring S] (e : R ≃+ S)
  (x : MonoidAlgebra S M), (fun x => Finsupp.mapRange ⇑e ⋯ x) ((fun x => Finsupp.mapRange ⇑e.symm ⋯ x) x) = x