∀ (c : Lean.Meta.Grind.Arith.Linear.RingIneqCnstr) (val : ℤ) (x n : Lean.Grind.Linarith.Var),
  sizeOf (Lean.Meta.Grind.Arith.Linear.RingIneqCnstrProof.cancelDen c val x n) =
    1 + sizeOf c + sizeOf val + sizeOf x + sizeOf n