why cakephp doesn't support pure MVC

if we declare a variable inside a model then we are unable to fetch its value in controller

e.g.  

Model M code:

class M extends AppModel

{

   var $x;

function setX(){

$this->x = "hello";

}

function getX(){

return $this->x;

}

}

controller M code

class M_controller extends AppController{

$this->M->setM();

$c = $this->M->getX();

}

when i check the $c in view page its blank 

can anybody explain what is happening over here

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