How to fix Script? error cs1525 Unexpected symbol 'vector3'

Hello everyone. I get Assets/Parallaxing.cs(43,31): error CS1525: Unexpected symbol 'vector3' using UnityEngine; using System.Collections;

 public class Parallaxing : MonoBehaviour {
 
     public Transform[] backgrounds;            //Lista de el fondo - foreground por se parallaxed
     private float[] parallaxCuanto;         //La proporcio de cuanto quiero que se mueva la camara
     public float suavizado = 1f;                 // Que tan suave tiene que ser el paralax (poner esto por encima de 0)
 
 
     private Transform cam;                  // reference to the main cameras trasnform
     private Vector3 ultposcam;              //Esto va a guardar la ultima posicion de la camara (en el ultimo frame)
 
     // Is called before start (). Bueno para referencias.
     void Awake () {
         // poner la referencia de la camara
         cam = Camera.main.transform;
     }
 
 // Use this for initialization
 void Start () {
     // the previous frame had thbe current frame's camera position 
         ultposcam = cam.position;
 
         //poniendole correspondientes parallaxScales
         parallaxCuanto = new float[backgrounds.Length];
         for (int i = 0; i < backgrounds.Length; i++) {
                         parallaxCuanto [i] = backgrounds [i].position.z * -1;
                 }
 }
         // Update is called once per frame
         void Update () {
 
         // for each background
         for (int i = 0; i < backgrounds.Length; i++) {
             // theparralax is the opposite of te camera movement becuase the previous frame multiplied by the scale
             float parallax = (ultposcam.x - cam.position.x) * parallaxScales [i];
             
             // set a target x position which is the current position plus the parallax
             float backgroundTargetPosX = backgrounds [i].position.x + parallax
 
             // create a target position which is the background's current positionwith it's target x position
             Vector3 backgroundTargetPos = new Vector3 (backgroundTargetPosX, backgrounds[i].position.y, backgrounds[i].position.z);
 
             // fade between current position and te target position using lerp
             backgrounds[i].position = Vector3.Lerp (backgrounds[i].position, backgroundTargetPos, suavizado * Time.deltatime);
             
     }
             // set the ultposcam to the camera's position at the end of the frame
                                                         ultposcam = cam.position;
 
 }
                                                     }