use 2139 * c1 + (349 * c3 + (-(864 * c2) + 713))
case right.succ.intro.intro.intro.intro.intro.intro.intro.right.right
a b✝ c : ℤθ
b : ℕ
c1 c2 c3 : ℤ
⊢ 3 ∣ 2139 + c1 * 6417 + (c3 * 1047 - c2 * 2592)
case h
a b✝ c : ℤθ
b : ℕ
c1 c2 c3 : ℤ
⊢ 2139 + c1 * 6417 + (c3 * 1047 - c2 * 2592) = 3 * (2139 * c1 + (349 * c3 + (-(864 * c2) + 713)))