∀ {A : Type u_1} [inst : CommSemiring A] {I : Ideal A} [inst_1 : DecidablePred fun x => x ∈ I] {m : ℕ} {a x : A},
  x ∈ I → DividedPowers.OfInvertibleFactorial.dpow I m (a * x) = a ^ m * DividedPowers.OfInvertibleFactorial.dpow I m x