∀ {ι : Type u_3} {ι' : Type u_1} (R : ι → Type u_2) (e : ι ≃ ι') [inst : (i : ι) → NonUnitalNonAssocSemiring (R i)]
  (x x_1 : (i : ι) → R i), (Equiv.piCongrLeft' R e).toFun (x + x_1) = (Equiv.piCongrLeft' R e).toFun (x + x_1)