∀ (R : Type u_2) {A : Type u_1} [inst : CommRing R] [inst_1 : StarRing R] [inst_2 : Ring A] [inst_3 : Algebra R A]
  [inst_4 : StarRing A] [inst_5 : StarModule R A] (x : A) [inst_6 : IsStarNormal x] (a b : ↥(StarAlgebra.adjoin R {x})),
  a * b = b * a