{motive_2 : Lean.Meta.Grind.Arith.Cutsat.EqCnstrProof → Sort u} →
  (t : Lean.Meta.Grind.Arith.Cutsat.EqCnstrProof) →
    t.ctorIdx = 7 →
      ((x : Int.Linear.Var) →
          (c₁ c₂ : Lean.Meta.Grind.Arith.Cutsat.EqCnstr) →
            motive_2 (Lean.Meta.Grind.Arith.Cutsat.EqCnstrProof.subst x c₁ c₂)) →
        motive_2 t