∀ {G : Type u_4} {E : Type u_5} [inst : MeasurableSpace G] [inst_1 : NormedAddCommGroup E] [inst_2 : NormedSpace ℝ E]
  [inst_3 : Group G] [MeasurableMul G] [MeasurableInv G] (f : G → E) (μ : MeasureTheory.Measure G) [μ.IsInvInvariant]
  [μ.IsMulLeftInvariant] (x' : G), ∫ (x : G), f (x' / x) ∂μ = ∫ (x : G), f x ∂μ