∀ {R : Type u_2} {A : Type u_1} [inst : CommSemiring R] [inst_1 : Semiring A] [inst_2 : Algebra R A] (_x : A)
  (motive : _x ∈ (algebraMap R A).rangeS → Prop) (x : _x ∈ (algebraMap R A).rangeS),
  (∀ (r : R) (hr : (algebraMap R A) r = _x), motive ⋯) → motive x