∀ {G : Type u_1} [inst : MeasurableSpace G] {μ : MeasureTheory.Measure G} [inst_1 : Group G] [MeasurableMul G]
  [μ.IsMulRightInvariant] (f : G → ENNReal) (g : G), ∫⁻ (x : G), f (x * g) ∂μ = ∫⁻ (x : G), f x ∂μ