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