∀ {A : Type u_2} [inst : CStarAlgebra A] [inst_1 : PartialOrder A] [StarOrderedRing A] {x y : A} (z : A),
  0 ≤ x → y ∈ Set.Icc x 1 → ∀ {c : NNReal}, ‖star z * (1 - x) * z‖₊ ≤ c ^ 2 → ‖z - y * z‖₊ ≤ c