Theorem: IMOSL.Extra.CharTwo.add_eq_iff_eq_add (IMOSLLean4/Extra/CharTwo/Defs.lean)

State before:
M : Type u_1
inst✝¹ : AddMonoid M
inst✝ : CharTwo M
x y z : M
⊢ x + y = z ↔ x = z + y
Tactic:
rw [← add_left_inj (z := y), add_add_cancel_right]
State after:
no goals