no goals
a b m n✝ k n d : ℕ
⊢ d * (n / d) = n ↔ d * (n / d) = d * (n / d) + n % d
rw [div_add_mod]
no goals
a b m n✝ k n d : ℕ
⊢ d * (n / d) = d * (n / d) + n % d ↔ d ∣ n
rw [self_eq_add_right, dvd_iff_mod_eq_zero]