∀ {R : Type u_1} (M : Type u_5) (M₂ : Type u_7) [inst : Semiring R] [inst_1 : AddCommMonoid M]
  [inst_2 : AddCommMonoid M₂] [inst_3 : Module R M] [inst_4 : Module R M₂] [inst_5 : Subsingleton M]
  [inst_6 : Subsingleton M₂] (x : M₂), (LinearEquiv.ofSubsingleton M M₂).symm x = 0