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

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