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