reduce_mod_3 rel
d a b i₁ i₂ : ℕ
hd : ↑d ≠ 0
rel : ↑a * (3 * ↑i₂ - ↑d) = ↑b * (2 * ↑d - 3 * ↑i₁ - 3 * ↑i₂)
⊢ ↑a = ↑b
d a b i₁ i₂ : ℕ
hd : ↑d ≠ 0
H₁✝ : 3 = 0
H₂✝ : 2 = -1
rel : ↑a = ↑b ∨ ↑d = 0
⊢ ↑a = ↑b