-- Module: Mathlib.Algebra.Symmetrized
Goal:
α : Type u_1
inst : Ring α
inst_1 : Invertible (α := α) 2
a b : αˢʸᵐ
commute_half_left :
  ∀ (a : α),
    @Invertible.invOf _ MulOne.toMul MulOne.toOne 2 _ * a = a * @Invertible.invOf _ MulOne.toMul MulOne.toOne 2 _
calc_2 :
  HMul.hMul (α := α) (@Invertible.invOf _ Distrib.toMul AddMonoidWithOne.toOne 2 _)
        (@Invertible.invOf _ Distrib.toMul AddMonoidWithOne.toOne 2 _) *
      (HMul.hMul (β := α)
              (HMul.hMul (α := α) (β := α) ((unsym : (a : αˢʸᵐ) → α) a : α) ((unsym : (a : αˢʸᵐ) → α) b : α))
              ((unsym : (a : αˢʸᵐ) → α) (a * a) : α) +
            HMul.hMul (β := α)
              (HMul.hMul (α := α) (β := α) ((unsym : (a : αˢʸᵐ) → α) b : α) ((unsym : (a : αˢʸᵐ) → α) a : α))
              ((unsym : (a : αˢʸᵐ) → α) (a * a) : α) +
          HMul.hMul (β := α)
            (HMul.hMul (α := α) (β := α) ((unsym : (a : αˢʸᵐ) → α) (a * a) : α) ((unsym : (a : αˢʸᵐ) → α) a : α))
            ((unsym : (a : αˢʸᵐ) → α) b : α) +
        HMul.hMul (β := α)
          (HMul.hMul (α := α) (β := α) ((unsym : (a : αˢʸᵐ) → α) (a * a) : α) ((unsym : (a : αˢʸᵐ) → α) b : α))
          ((unsym : (a : αˢʸᵐ) → α) a : α)) =
    HMul.hMul (α := α) (@Invertible.invOf _ Distrib.toMul AddMonoidWithOne.toOne 2 _)
        (@Invertible.invOf _ Distrib.toMul AddMonoidWithOne.toOne 2 _) *
      (HMul.hMul (β := α)
              (HMul.hMul (α := α) (β := α) ((unsym : (a : αˢʸᵐ) → α) a : α) ((unsym : (a : αˢʸᵐ) → α) b : α))
              ((unsym : (a : αˢʸᵐ) → α) (a * a) : α) +
            HMul.hMul (β := α)
              (HMul.hMul (α := α) (β := α) ((unsym : (a : αˢʸᵐ) → α) a : α) ((unsym : (a : αˢʸᵐ) → α) (a * a) : α))
              ((unsym : (a : αˢʸᵐ) → α) b : α) +
          HMul.hMul (β := α)
            (HMul.hMul (α := α) (β := α) ((unsym : (a : αˢʸᵐ) → α) b : α) ((unsym : (a : αˢʸᵐ) → α) (a * a) : α))
            ((unsym : (a : αˢʸᵐ) → α) a : α) +
        HMul.hMul (β := α)
          (HMul.hMul (α := α) (β := α) ((unsym : (a : αˢʸᵐ) → α) (a * a) : α) ((unsym : (a : αˢʸᵐ) → α) b : α))
          ((unsym : (a : αˢʸᵐ) → α) a : α))
⊢ HMul.hMul (α := α) (@Invertible.invOf _ Distrib.toMul AddMonoidWithOne.toOne 2 _)
        (@Invertible.invOf _ Distrib.toMul AddMonoidWithOne.toOne 2 _) *
      (HMul.hMul (β := α)
              (HMul.hMul (α := α) (β := α) ((unsym : (a : αˢʸᵐ) → α) a : α) ((unsym : (a : αˢʸᵐ) → α) b : α))
              ((unsym : (a : αˢʸᵐ) → α) (a * a) : α) +
            HMul.hMul (β := α)
              (HMul.hMul (α := α) (β := α) ((unsym : (a : αˢʸᵐ) → α) b : α) ((unsym : (a : αˢʸᵐ) → α) a : α))
              ((unsym : (a : αˢʸᵐ) → α) (a * a) : α) +
          HMul.hMul (β := α)
            (HMul.hMul (α := α) (β := α) ((unsym : (a : αˢʸᵐ) → α) (a * a) : α) ((unsym : (a : αˢʸᵐ) → α) a : α))
            ((unsym : (a : αˢʸᵐ) → α) b : α) +
        HMul.hMul (β := α)
          (HMul.hMul (α := α) (β := α) ((unsym : (a : αˢʸᵐ) → α) (a * a) : α) ((unsym : (a : αˢʸᵐ) → α) b : α))
          ((unsym : (a : αˢʸᵐ) → α) a : α)) =
    HMul.hMul (α := α) (@Invertible.invOf _ Distrib.toMul AddMonoidWithOne.toOne 2 _)
        (@Invertible.invOf _ Distrib.toMul AddMonoidWithOne.toOne 2 _) *
      (HMul.hMul (α := α) ((unsym : (a : αˢʸᵐ) → α) a : α)
            (HMul.hMul (α := α) (β := α) ((unsym : (a : αˢʸᵐ) → α) b : α) ((unsym : (a : αˢʸᵐ) → α) (a * a) : α)) +
          HMul.hMul (α := α) ((unsym : (a : αˢʸᵐ) → α) a : α)
            (HMul.hMul (α := α) (β := α) ((unsym : (a : αˢʸᵐ) → α) (a * a) : α) ((unsym : (a : αˢʸᵐ) → α) b : α)) +
        HMul.hMul (β := α)
          (HMul.hMul (α := α) (β := α) ((unsym : (a : αˢʸᵐ) → α) b : α) ((unsym : (a : αˢʸᵐ) → α) (a * a) : α) +
            HMul.hMul (α := α) (β := α) ((unsym : (a : αˢʸᵐ) → α) (a * a) : α) ((unsym : (a : αˢʸᵐ) → α) b : α))
          ((unsym : (a : αˢʸᵐ) → α) a : α))

Tactic:
rw [add_mul, ← add_assoc, ← mul_assoc, ← mul_assoc]

Premises used: add_mul, add_assoc, mul_assoc