no goals
α : Type u
inst✝ : Monoid α
a✝ b✝ c u : αˣ
a b : α
h : a = b * ↑c⁻¹
⊢ a * ↑c = b
rw [h, inv_mul_cancel_right]
no goals
α : Type u
inst✝ : Monoid α
a✝ b✝ c u : αˣ
a b : α
h : a * ↑c = b
⊢ a = b * ↑c⁻¹
rw [← h, mul_inv_cancel_right]