∀ {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 b c : R}, c < 0 → a ≤ b * c → b ≤ a * c⁻¹