∀ {C : Type u_2} [inst : CategoryTheory.Category.{u_1, u_2} C] [inst_1 : CategoryTheory.Preadditive C] {S : Type u_3}
  [inst_2 : CommSemiring S] [inst_3 : CategoryTheory.Linear S C] (X Y Z : C) (m : S) (x : X ⟶ Y),
  CategoryTheory.Linear.leftComp S Z (m • x) = (RingHom.id S) m • CategoryTheory.Linear.leftComp S Z x