2D infinate runner generation

I am in the middle of creating a 2D infinite runner game for a mobile device. I am stuck on the generation part. I have this so far but it doesn't work at all. The left, right, rightobj and leftobj are colliders

   using UnityEngine;
   using System.Collections;
   
   public class Generator : MonoBehaviour {
       public GameObject[] platforms;
       public Transform left;
       public Transform right;
       public GameObject rightobj;
       public GameObject leftobj;
       public Transform player;
   
   // Use this for initialization
   void Start ()
   {
       rightobj.SetActive (true);
   }
   
   // Update is called once per frame
   void Update () 
   {
       Platforms ();
   }
  
   void Platforms()
   {
       rightobj.SetActive (true);
       float rightPos = right.transform.position.x;
       float leftPos = left.transform.position.x;
       float playerPos = player.transform.position.x;
       int num = Random.Range (0, platforms.Length);
       if (rightPos - playerPos > 5.0f && (rightPos % 7 < 0.1 || rightPos % 7 > 6.9)) 
       {
           Instantiate (platforms[num], new Vector3(rightPos,0.85f,0.0f), Quaternion.identity);
           print ("generating platforms");
       } 
       else 
       {
           rightobj.SetActive (false);
           print ("not 5");
       }
  
       if (Mathf.Abs(leftPos - playerPos) > 2.0f) 
       {
           Destroy(platforms[num]);
           print ("DESTROY THEM!!!!");
       }
   }

}

When I run the script This happens.