proposition: Lemma divp_mulCA d p q : d %| p -> d %| q -> p * (q %/ d) = q * (p %/ d).
proof: Proof. by move=> hdp hdq; rewrite mulrC divp_mulAC // divp_mulA. Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop ssralg poly)