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Local Open Scope Z_scope.
(** Factorization lemmas *)
(** Other specific variants of theorems dedicated for the Omega tactic *)

Lemma OMEGA15 v c1 c2 l1 l2 k2 :
v * c1 + l1 + (v * c2 + l2) * k2 = v * (c1 + c2 * k2) + (l1 + l2 * k2).