Theorem: ENatValRing.sub_val_x_zero (ECTate/Algebra/ValuedRing.lean)

State before:
R : Type u
inst✝¹ : CommRing R
inst✝ : IsDomain R
p : R
evr : ENatValRing p
x : R
⊢ sub_val evr 0 x = x
Tactic:
simp [sub_val_eq]
State after:
no goals