Pagination in Laravel doesn't work

My post Controller : class QuestionsController extends Controller {

/**
 * Display a listing of the resource.
 *
 * @return Response
 */
public function index()
{


       $questions = \App\Question::latest()->paginate(6);
               $questions = \App\Question::unsolved();
               $bars     = \App\Question::unsolvedbar();
               $links = str_replace('/?', '?', $questions->render());
       return view('questions.index',compact('questions','bars','links'));
}

My Pagination Links in my View: {!! $questions->links(); !!}

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