Definition divTerm :
  Term A n ->
  forall (b : Term A n) (nZb : ~ zeroP (A:=A) A0 eqA (n:=n) b), Term A n.

Theorem divTerm_multTerm_l : forall (a b c : Term A n) (nZa : ~ zeroP (A:=A) A0 eqA (n:=n) a), eqTerm (A:=A) eqA (n:=n) b (multTerm (A:=A) multA (n:=n) (divTerm b nZa) a) -> eqTerm (A:=A) eqA (n:=n) (divTerm (multTerm (A:=A) multA (n:=n) c b) nZa) (multTerm (A:=A) multA (n:=n) c (divTerm b nZa)).