Theorem: Section5sheet2.WeakGroup.mul_eq_of_eq_inv_mul (FormalisingMathematics2024/Section05groups/Sheet2.lean)

State before:
G : Type
inst✝ : WeakGroup G
a b c : G
h : b = a⁻¹ * c
⊢ a * b = c
Tactic:
sorry
State after:
no goals