substract for two field for two object laravel

good evening, I want to do the subtraction between two objects there that quantity of the sale and product quantity of product

this is the controller

 public function create(Request $request)
              {

                $vente = new Vente;
              $vente->produit_id = $request->produit_id;
              $vente->user_id =Auth::user()->id;
              $vente->quantitevendu = $request->quantitevendu;
              $vente->prix = $request->prix;
              $vente->description = $request->description;
              $produit=Produit::findOrFail($request->produit_id);

              $remain =((int)$produit->quantite - (int)$request->quantitevendu);
              $produit->quantite=$remain;

             $vente->save();

                  Session::flash('message','la vente a été crée avec succès');
                    return redirect('/ventes');
                  }

if some one have any suggestions

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