theorem extracted_formal_statement_167.{u_3, u_2, u_1} {E₁ : Type u_1} {E₂ : Type u_2} {F : Type u_3}
  [inst : NormedAddCommGroup E₁] [inst_1 : InnerProductSpace ℝ E₁] [inst_2 : FiniteDimensional ℝ E₁]
  [inst_3 : NormedAddCommGroup E₂] [inst_4 : InnerProductSpace ℝ E₂] [inst_5 : FiniteDimensional ℝ E₂]
  [inst_6 : NormedAddCommGroup F] [inst_7 : InnerProductSpace ℝ F] [inst_8 : FiniteDimensional ℝ F]
  {admm : ADMM E₁ E₂ F} {admm_kkt : Existance_of_kkt admm} [inst_9 : Setting E₁ E₂ F admm admm_kkt] (n : ℕ) :
  let succ_n := (n + 1).toPNat';
  let ey' := ey ↑succ_n;
  let e₁' := e₁ ↑succ_n;
  let e₂' := e₂ ↑succ_n;
  ⟪(ContinuousLinearMap.adjoint (OptProblem.A₂ E₁))
        (-ey' - ((1 - ADMM.τ E₁ E₂ F) * ADMM.ρ E₁ E₂ F) • ((OptProblem.A₁ E₂) e₁' + (OptProblem.A₂ E₁) e₂')),
      e₂'⟫_ℝ =
    ⟪-(ContinuousLinearMap.adjoint (OptProblem.A₂ E₁))
          (ey' + ((1 - ADMM.τ E₁ E₂ F) * ADMM.ρ E₁ E₂ F) • ((OptProblem.A₁ E₂) e₁' + (OptProblem.A₂ E₁) e₂')),
      e₂'⟫_ℝ := sorry

State before:
E₁ : Type u_1
E₂ : Type u_2
F : Type u_3
inst✝⁹ : NormedAddCommGroup E₁
inst✝⁸ : InnerProductSpace ℝ E₁
inst✝⁷ : FiniteDimensional ℝ E₁
inst✝⁶ : NormedAddCommGroup E₂
inst✝⁵ : InnerProductSpace ℝ E₂
inst✝⁴ : FiniteDimensional ℝ E₂
inst✝³ : NormedAddCommGroup F
inst✝² : InnerProductSpace ℝ F
inst✝¹ : FiniteDimensional ℝ F
admm : ADMM E₁ E₂ F
admm_kkt : Existance_of_kkt admm
inst✝ : Setting E₁ E₂ F admm admm_kkt
n : ℕ
succ_n : ℕ+ := (n + 1).toPNat'
ey' : F := ey ↑succ_n
e₁' : E₁ := e₁ ↑succ_n
e₂' : E₂ := e₂ ↑succ_n
y_k_1 : F := ADMM.y E₁ E₂ ↑succ_n
v_k_1 : E₂ := v ↑succ_n
x_diff : E₂ := ADMM.x₂ E₁ F ↑succ_n - admm_kkt.x₂
⊢ ⟪(ContinuousLinearMap.adjoint (OptProblem.A₂ E₁))
        (-ey' - ((1 - ADMM.τ E₁ E₂ F) * ADMM.ρ E₁ E₂ F) • ((OptProblem.A₁ E₂) e₁' + (OptProblem.A₂ E₁) e₂')),
      e₂'⟫_ℝ =
    ⟪-(ContinuousLinearMap.adjoint (OptProblem.A₂ E₁))
          (ey' + ((1 - ADMM.τ E₁ E₂ F) * ADMM.ρ E₁ E₂ F) • ((OptProblem.A₁ E₂) e₁' + (OptProblem.A₂ E₁) e₂')),
      e₂'⟫_ℝ

Tactic: rw [sub_eq_add_neg, ← neg_add, A₂†.map_neg]

State after:

Relevant lemmas:
sub_eq_add_neg : ∀ {G : Type u_1} [inst : SubNegMonoid G] (a b : G), a - b = a + -b
map_neg : ∀ {G : Type u_7} {H : Type u_8} {F : Type u_9} [inst : FunLike F G H] [inst_10 : AddGroup G]
  [inst_11 : SubtractionMonoid H] [inst_12 : AddMonoidHomClass F G H] (f : F) (a : G), f (-a) = -f a
neg_add : ∀ {α : Type u_1} [inst : SubtractionCommMonoid α] (a b : α), -(a + b) = -a + -b