∀ {R : Type u} [inst : Lean.Grind.Field R] [inst_1 : LE R] [inst_2 : LT R] [Std.LawfulOrderLT R]
  [inst_4 : Std.IsLinearOrder R] [Lean.Grind.OrderedRing R] (a c : R) {b : R}, b < 0 → (a * b⁻¹ < c ↔ c * b < a)