use 5553 * c1 + (906 * c3 + (-(2243 * c2) + 1851))
case right.succ.intro.intro.intro.intro.intro.intro.intro.right.left
a b✝ c : ℤθ
b : ℕ
c1 c2 c3 : ℤ
⊢ 3 ∣ 5553 + c1 * 16659 + (c3 * 2718 - c2 * 6729)
case h
a b✝ c : ℤθ
b : ℕ
c1 c2 c3 : ℤ
⊢ 5553 + c1 * 16659 + (c3 * 2718 - c2 * 6729) = 3 * (5553 * c1 + (906 * c3 + (-(2243 * c2) + 1851)))