Vector3 Transform.Position Not Working

In the script below when facing left is true I want my GameObject (the one this script is attached to) to reset its y position and then move it to the right while keeping its new y position. So on play give object a random y position within two specified points and then while keeping that new y position move it to the right. But Vector 3 will not allow me to assign a transform.position to it and gives me the error below.

Script:

 #pragma strict
 
 var bounceControllerScript : Bounce_Controller_Script;
 
 var objectsOriginalPos : Vector3;
 
 public var smooth : float;
 private var newPosition : Vector3;
 
 var stopPositioningTrigger = false;
 
 function Awake ()
 {
     gameObject.transform.position.x = -8;
     objectsOriginalPos = transform.position;
 }
 
 
 function Update ()
 {
     PositionChanging();
 }
 
 
 function PositionChanging ()
 {
     if (Bounce_Controller_Script.facingLeft == true)
     {
         var newPosition : Vector3 = new Vector3(-2.68, objectsOriginalPos, 0);
         
         transform.position = Vector3.Lerp(transform.position, newPosition, smooth * Time.deltaTime);
         
     }
 }

Error

BCE0024: The type 'UnityEngine.Vector3' does not have a visible constructor that matches the argument list '(float, UnityEngine.Vector3, int)'.